[CentOS] SpamAssassin reporting help

Wed Sep 19 15:45:28 UTC 2012
Jason T. Slack-Moehrle <slackmoehrle at gmail.com>

Hello All,

CentOS release 6.3 (Final)

I am getting e-mails now where they are:

Subject: Cron <root at www> /usr/share/spamassassin/sa-update.cron 2>&1 |
tee -a /var/log/sa-update.log

Body: http: GET http://daryl.dostech.ca/sa-update/asf/1387055.tar.gz
request failed: 404 Not Found: <!DOCTYPE HTML PUBLIC "-//IETF//DTD
HTML 2.0//EN"> <html><head> <title>404 Not Found</title> </head><body>
<h1>Not Found</h1> <p>The requested URL /sa-update/asf/1387055.tar.gz
was not found on this server.</p> <hr> <address>Apache/2.2.6 (Fedora)
Server at daryl.dostech.ca Port 80</address> </body></html>

Can anyone help me understand what is happening here?

Are they trying to inject an http request, looking for a specific
file? Or checking to see if I am running a piece of software that has
vulnerabilities to exploit?