Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3a4c0da45a3ab10…

MALICIOUS

PDF

30.4 KB Authoring application: Smallpdf Desktop
MD5: 186dffa58e55b06f24310c4324c18a2f SHA-1: 7f32f6f53f2563733737003e9870a8eef1a33af9 SHA-256: d3a4c0da45a3ab10dc376a4516852623f9c89c35e49359b47005b98860df2fab
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files, a technique commonly used for SEO poisoning and distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs are likely part of a link farm designed to redirect users to further malicious downloads.

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://cobylight.com/uploads/1/3/0/6/130604243/mefemanadabur_xidofabad_mumefen.pdf
    • http://oakridgefootballbooster.com/uploads/1/3/0/7/130775907/bifeduk-mogefiw-mixamexuxikujek-zofimateg.pdf
    • http://pierviewcoffee.net/uploads/1/3/0/2/130289563/subilinojet.pdf
    • http://shands.library.mesquiteisd.org/uploads/1/3/0/5/130545827/jotiwixavuzuladisad.pdf
    • http://simplyexquisitehg.com/uploads/1/3/0/6/130639775/2586841.pdf
    • http://merril.biz/uploads/1/3/0/6/130621068/2216547.pdf
    • http://copilots4.life/uploads/1/3/0/6/130604243/kodusezamokebisujawi.pdf
    • http://boonccb.com/uploads/1/3/0/8/130813079/8892709.pdf
    • http://nsolc.com/uploads/1/3/0/4/130478106/2154164.pdf
    • http://mail.thehalltribe.com/uploads/1/3/0/6/130621480/xomirolepunis-sofazirulekozaz-gufopo.pdf
    • http://rivermethod.com/uploads/1/3/0/2/130272355/3306374.pdf
    • http://craftedbykerri.com/uploads/1/3/0/5/130589229/xilad.pdf
    • http://jindubaijiale.br3h.com/uploads/1/3/0/2/130273623/130273623.html#longman+academic+writing+series+4+answer+pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000204a.bin
b9206af19a049a6a859a5b77a747b6ad3881ca053ea9a4ab10c2c9581f1a7fb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x204A 7256 bytes

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