Hi Saksham,
Moz considers 17 main factors for the spam score. Therefore it might take more efforts for down the spam score. Attached a link to the blog that explain each one in detail. Good luck!
Mª Verónica
✓Low MozTrust or MozRank Score
The site link profile is not trustworthy.
✓Large Site with Few Links
We found very few sites linking to this site, considering its size.
✓Site Link Diversity is Low
The diversity of link sources to this subdomain is low.
✓Ratio of Followed to Nofollowed Subdomains
The ratio of followed to nofollowed subdomains linking to this subdomain is outside the normal range of others in our index.
✓Ratio of Followed to Nofollowed Domains
The ratio of followed to nofollowed domains linking to this subdomain is outside the normal range of others in our index.
✓Small Proportion of Branded Links
Links to this subdomain have low amounts of branded anchor text.
✓Thin Content
A subset of pages within this subdomain have little content.
✓Site Mark-up is Abnormally Small
There's a high ratio of visible text compared to HTML, JavaScript, etc.
✓Large Number of External Links
A subset of pages within this subdomain has a large number of external links.
✓Low Number of Internal Links
Pages crawled on the subdomain have a small number of internal links.
✓Anchor Text Heavy Page
There's a high ratio of anchor text compared to content text.
✓External Links in Navigation
There's a large number of external links within sidebars and footers.
✓No Contact Info
None of the pages crawled contain an email address or links to a social profile.
✓Low Number of Pages Found
Crawl only gets a valid response to a small number of pages.
✓TLD Correlated with Spam Domains
This subdomain is on a top level domain (TLD) extension often found to be the source of spam links.
✓Domain Name Length
This domain name's character count is higher than average.
✓Domain Name Contains Numerals
Domain names including numbers are often found to be the source of spam links.
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