Malicious PDF — malware analysis report

Static analysis result for SHA-256 390c94e2573f6790…

MALICIOUS

PDF

68.9 KB Authoring application: SWFTools
MD5: cc7cbb95c5c5e6cc30d8ac2c1bb5a448 SHA-1: 830b9de2ed4738f7334f57583a92d461209b1c78 SHA-256: 390c94e2573f679077814482ecb5192b47eb8d4fa4363ad113be4ab97867ffe0
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The PDF_SEO_LINK_FARM heuristic specifically identified a large number of external links within the document, with the primary domain being low.sitibaik.ru. These links are likely used to redirect users to phishing sites or download further malicious content. The document body contains a mix of seemingly random text and embedded URLs, further supporting the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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://low.sitibaik.ru/uploads/2020/01/27/9a311d7f9.pdf
    • http://kinesiologyandcounselling.com/uploads/1/3/0/6/130604169/pifanulupidalakalu.pdf
    • http://whatthehula.net/uploads/1/3/0/5/130551256/0123f171c665e.pdf
    • http://loudmountains.com/uploads/1/3/0/2/130287995/413351.pdf
    • http://1001edrutherford.com/uploads/1/3/0/2/130289502/61936d1414c8a.pdf
    • http://tede.elkonas.store/uploads/2020/01/28/0ec7d5c.pdf
    • https://kudufuwokon.weebly.com/uploads/1/3/0/4/130488955/jegefinupu.pdf
    • http://designerpaws.org/uploads/1/3/0/6/130605118/a9719fe.pdf
    • http://urbanthistle.online/uploads/1/3/0/5/130543855/pusonanikojidez.pdf
    • http://lamu.l4d4.ru/uploads/2020/01/27/9ca00f8206877f.pdf
    • https://rogikeberewivo.weebly.com/uploads/1/3/0/6/130604527/6618117.pdf
    • http://vudevederi.audiostart15.icu/uploads/2020/01/28/xejavidowufu.pdf
    • http://setkeyanimation.com/uploads/1/3/0/5/130551186/fejanag-biratewo-pobomibi-golemo.pdf
    • http://linlinyang.com/uploads/1/3/0/6/130605065/nisidowodub.pdf
    • https://misezidudop.weebly.com/uploads/1/3/0/6/130604304/funixojaxebala.pdf
    • http://shopbelfast.info/uploads/1/3/0/6/130620927/130620927.html#assassination+classroom+knife

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000014a4.bin
3d3ebc444b8de22bbcbe72f41fb5794600002adbd3c85ac92e52867ff683bc56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A4 9716 bytes
font_01_sfnt_off00008bea.bin
47244ddb20d6c5ba4a7c8bf9bd4bc699dcfea3d5cad318562042d98512d21ffc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BEA 26936 bytes

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