From Accounts Payable [firstname.lastname@example.org]I have only seen a single sample with an attachment named Pay_Advice_Vendor_0000300320_1000_for_03.03.2016.PDF.ZIP which contains a randomly-named malicious script with a detection rate of 3/54.
Date Tue, 08 Mar 2016 10:32:52 +0200
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Yorkshire Water Services Limited
Registered Office Western House, Halifax Road, Bradford, BD6 2SZ
Registered in England and Wales No 2366682
According to the Malwr report and Hybrid Analysis on this sample, it downloads a malicious binary from:
This binary has a detection rate of 2/54 and all those reports indicate that it phones home to:
18.104.22.168 (PSINet, Canada)
I recommend that you block traffic to that IP. The Malwr report on the dropped binary is inconclusive, but it looks like the Dridex banking trojan.