Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f7d4b711e6ab85…

MALICIOUS

PDF

39.1 KB Authoring application: Smallpdf Desktop
MD5: 932490fcd82eda45a2c0510fcfc6a1c1 SHA-1: 060e0441fc64af78d49629940e997a66867564f8 SHA-256: 64f7d4b711e6ab8592b587141b540dfbf616350313d2b8bc26e25dc8a1b8b7ce
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure point towards an attempt to lead the user to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://autismbroadband.com/uploads/1/3/0/2/130291589/posivobalilamiritogo.pdf
    • http://sitandgrin3.com/uploads/1/3/0/4/130476339/sasovupore.pdf
    • http://depthdetail.net/uploads/1/3/0/6/130604166/jokevo_metupukaruki_fibabidigax_dilejofux.pdf
    • http://naturesowncharcoal.com/uploads/1/3/0/2/130288673/3690746.pdf
    • http://amusee.fr/uploads/1/3/0/6/130640199/9780328.pdf
    • http://aedutah.com/uploads/1/3/0/6/130605083/fiduwajaratix-jakirawal.pdf
    • http://cbconservation.com/uploads/1/3/0/3/130323236/kokawa-kasumosowavux.pdf
    • http://saeedalmuhairy.com/uploads/1/3/0/6/130621185/6643eee574.pdf
    • http://berkeleyfpdocs.com/uploads/1/3/0/2/130287875/rerodilepotum.pdf
    • http://nimblescooters.eu/uploads/1/3/0/7/130738790/litobavogifuved-berimipuguvojo-xikom.pdf
    • http://indianhillspto.org/uploads/1/3/0/4/130489898/lutafofisanepafu.pdf
    • http://cecilyeiferle.com/uploads/1/3/0/7/130740169/130740169.html#motivation+letter+for+phd+in+chemical+engineering

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000134f.bin
f90249ac2143cc7e9604b0e26140df2c11cdcd8825089aad8b4fbcd47ef5f2a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134F 9084 bytes

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