Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8d02edf78f0a88…

MALICIOUS

PDF

62.2 KB Authoring application: SWFTools
MD5: b3c58fab66e02f517f2c9b4b40f33df8 SHA-1: 578aa79bea049317f8755b7bc4b458ed4c240a9a SHA-256: 3b8d02edf78f0a8801297733bd171f42c671d974c9f4efbcf9a73eb878d9a30c
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded links to external PDF files, as indicated by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier also flag this file as malicious, specifically identifying it as a phishing attempt. The document body, though partially corrupted, contains URLs that are part of this link farm, suggesting a coordinated effort to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cashmere-shop.ru/uploads/2020/01/27/bobotawog.pdf
    • http://zowi.mindcraftstudio.com/uploads/2020/01/28/55a988f753df.pdf
    • http://wodini.manipulyator116.ru/uploads/2020/01/28/pamesudabixeton.pdf
    • http://zod.muaxehoigiatot.com/uploads/2020/01/29/nukun.pdf
    • https://gapelisugox.weebly.com/uploads/1/3/0/5/130539270/kodumilifuzav.pdf
    • https://wosapola.weebly.com/uploads/1/3/0/3/130313247/votot.pdf
    • http://jetiwekeja.glavmoskuhni.ru/uploads/2020/01/29/tininirobiverifedog.pdf
    • http://glebeaux.com/uploads/1/3/0/2/130287456/batevuf-wedekowefi.pdf
    • http://humannaturefoundation.com/uploads/1/3/0/5/130544110/130544110.html#create+the+atomic+orbital+diagram+fo

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000012bf.bin
eaf51fc628cd5504036a1714e5befd95151a0a19111ca1518a0fab15e3cd93ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF 9432 bytes
font_01_sfnt_off0000b7e4.bin
11e34b0b37abd7e6e7bb061f117c80bfbb63dfaabaddecd3764c23fb82bb0e1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E4 3164 bytes

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