First - calm down and see with attention this screen.
This screen in OSE "Inbound links" show all types of links - this page only, sub-domain level, domain level, internal, external, redirects, follow, nofollow, etc. In order to filter some of them you need to use three drop downs. Also internal links isn't spam signal.
So score 5/17 meaning:
- Low MozTrust or MozRank score
- Large site with few links
- Site link diversity is low
So first can be fixed with few more links over internet. This will heal also second issue. The most interesting is third - you need to play with anchor text to make something called "perfect link profile". I'm not going to explain here what this mean but in theory you should link your site with different anchors with different links. This can be image links, "click here", "visit site" and many other.
I think that read your question few days ago about some site issues as i remember. So you need to make technical audit of your site and his link profile before proceed with link building.
PS: Also please check Rand explanation about Moz Spam Score:
https://moz.com/blog/spam-score-mozs-new-metric-to-measure-penalization-risk
https://moz.com/blog/understanding-and-applying-mozs-spam-score-metric-whiteboard-fridayhttps://moz.com/help/guides/research-tools/open-site-explorer/spam-analysis
and see what are your issues compared to other. I'm not paying customer and unfortunately i can't see this report for your site.