Sounds perhaps like a program that may ask for a ICMP echo or stamp request....but you said UDP and then ICMP....
hhhm, perhaps whatever it is, you are trying to send back a destination unreachable packet via ICMP and it fails to send so his side dies and then resends.
Sounds extremely harmless in my book. A big, inefficient waste of time too.
Can you post the entire UDP packet?
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