C6 Messenger Downloader — PDF malware analysis

Static analysis result for SHA-256 67fc285780fe5b8d…

MALICIOUS

PDF

53.6 KB Created: 2011-04-27 03:11:02 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 3.0.015 (http://www.tcpdf.org))
MD5: c52cb67a4263d0bdda14b22330212036 SHA-1: e74ca42c883251962ba6690e62c9e6c15d1b43e3 SHA-256: 67fc285780fe5b8d97bc49dd925c43ef1627e221578549e85ade7c59becc4c95
64 Risk Score

Malware Insights

C6 Messenger Downloader · confidence 90%

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is a PDF file that exploits the CVE-2008-2551 vulnerability, indicated by the 'C6 Messenger DownloaderActiveX exploit' heuristic. This exploit is designed to download and execute a second-stage payload. The embedded URLs, while benign according to reputation data, are part of the document's lure, suggesting a phishing or social engineering attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4916

Heuristics 3

  • C6 Messenger DownloaderActiveX exploit critical CVE exact CVE_2008_2551
    PDF stream bytes contain HTML/ActiveX content configuring the vulnerable C6 Messenger DownloaderActiveX control with propDownloadUrl and propPostDownloadAction=run. This is the published exploit shape for CVE-2008-2551.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://artisanballoonz.com/system/system.exe
    • http://www.presstv.ir/Persian.aspx?id=10358
    • http://www.irna.ir/View/FullStory/?NewsId=1151206
    • http://www.presstv.ir/Persian.aspx?id=10353
    • http://www.irna.ir/View/FullStory/?NewsId=1149715
    • http://www.iribnews.ir/Default.aspx?Page=MainContent&news_num=228558
    • http://www.iribnews.ir/Default.aspx?Page=MainContent&news_num=228516
    • http://www.iribnews.ir/Default.aspx?Page=MainContent&news_num=228526
    • http://www.presstv.ir/Persian.aspx?id=10358������
    • http://www.presstv.ir/Persian.aspx?id=10353������
    • http://www.irna.ir/View/FullStory/?NewsId=1149715������
    • http://www.iribnews.ir/Default.aspx?Page=MainContent&news_num=228558���������������
    • http://www.iribnews.ir/Default.aspx?Page=MainContent&news_num=228516���������������������
    • http://c6.community.alice.it/download/DownloaderActiveX.cab#Version=1,0,0,1

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000017d8.bin
80ce46be3b4d5733393d911e720cc341eac961413bc8841086c1643fee9fc14b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17D8 73272 bytes

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