I had this sequence of hits recently from 103.187.190.61 which belongs to AS135133 PI DATA CENTERS PRIVATE LIMITED (India):

POST /sdk
GET /nmaplowercheck1675455083
GET /evox/about
GET /nmaplowercheck1675455083
GET /HNAP1

The UA was:

Mozilla/5.0 (compatible; Nmap Scripting Engine; [nmap.org...]

I was curious about the "nmaplowercheck" thing. I found this exchange about it on twitter:

=============
Have you noticed the "/nmaplowercheck<digits>" requests when scanning Web servers with nmap? Where do they come from?

The culprit is "identify_404()" in its HTTP lib. It allows to see how the server answers to not-found pages: with 404 or 200 code?

[github.com...]
==============

The only action I'm taking regarding this is to (as usual) add the entire AS to my router's IP blocking list. If anyone here finds it interesting then please do discuss. I have no idea what they're trying to do (except for the usual trying to hack a web server).