From the way I see, into urlscan.io there is no reference of adsv123.com, anyway there is ads123.com,
Search - urlscan.io
Now, the best approach would be using NetMonitor and see who triggered that connection in my opinion
https://play.google.com/store/apps/details?id=org.secuso.privacyfriendlynetmonitorapp
I deal with many Android apps, thousands, this is not common way of advertising, you could expect and flag the application that do this as malware.
If you have time, you could also export the list of apps you have and analyze them one by one, from your description that seems more than an api call for advertising, an app widget launching on boot, probably is not the only domain contacted, but only what you can see, at DNS level I am quite sure there is more.
P.S. Analyzing a bit, and seeing low results, I suspect that site you see is only the final result of a redirect chain, in this case NetMonitor should be the best choice for you to detect that shady app,
Examples:
Search - urlscan.io
P.P.S.
I think this domain is a sort of generator for redirect chains, used by some apps for shady advertising