Google malware diagnosis page is an overview page that lists information in order to potential problems like trojans or exploits for any domain. By appending "safebrowsing/diagnostic?site=" to the end of google.com URL + any domain name, Google will show you:
- The current listing status of the site
- How Google visited the site
- Whether the site acted as an intermediary resulting in further distribution of malware
- Whether the site has hosted malware
For example, the link below shows you the current status of yahoo.com:
"Despite all of these findings, google.com is not listed as suspicious, probably because the domain is whitelisted or the suspicious content is not very significant. It's likely that the domains listed above are from Google's search results, so that means the anti-malware system doesn't respect robots.txt".