Hi Jorge,
I'm not sure exactly what you are hoping to find out? The senders IP address? that's already available (see the log).
Generally speaking, if you have a server on the internet you will get a _lot_ of "traffic" - both empty connections, and very obvious malicious requests, all the time. You can expect probably hundreds, if not thousands of these per day. there's nothing you can do about this, except understand that they are harmless.
If you get bombarded from a single IP address then you can "ban" the address as a short term measure.
Cheers
Bruce