Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d4ef805a6a7574…

MALICIOUS

PDF

35.7 KB Authoring application: PDFBox
MD5: fd6c162025bb11f5615cd61166badc12 SHA-1: 8f0cc6d6e19ee18a7bf1b8fbb5dd7fb08edb6daa SHA-256: f4d4ef805a6a757450964cae85e827540edc2f83e3b3ec7c4cacb6d8b4c2ffb4
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to PDF size reduction, which serves as a pretext to direct users to download other PDF files. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or redirection mechanism.

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://canausvisa.ca/uploads/1/3/0/7/130740323/8ad640b03a.pdf
    • http://soulfeastco.com/uploads/1/3/0/4/130436017/paxetowuzofuxo_guwaf.pdf
    • http://searchdmd.com/uploads/1/3/0/4/130435578/nunirupanik.pdf
    • http://vincommerce.org/uploads/1/3/0/4/130483875/kajusedulawefitiv.pdf
    • http://epaprofessionalhome.com/uploads/1/3/0/8/130813967/tupasaxuxexuni_xarijilexuxaj_pikuv_ninegebobex.pdf
    • http://appeahse.com/uploads/1/3/0/6/130620694/aa8a44f86.pdf
    • http://www.roncocamana.com/uploads/1/3/0/4/130493476/7996071.pdf
    • http://northolmstedgymnastics.com/uploads/1/3/0/5/130589020/sidawoduxarivu.pdf
    • http://colo-ip51.mnemonix.com/uploads/1/3/0/7/130776804/8939586.pdf
    • http://corningyoga.com/uploads/1/3/0/5/130543064/zenomulupet.pdf
    • http://theblockhousecafe.com/uploads/1/3/0/7/130776061/jagalovi.pdf
    • http://themodcube.com/uploads/1/3/0/6/130604286/vuxelavekofutaraju.pdf
    • http://goodwoodgolfclub.com/uploads/1/3/0/4/130476346/9636421.pdf
    • http://www.borelboardgame.com/uploads/1/3/0/2/130270996/jarejopamibegiguniji.pdf
    • http://indien-nothilfe.de/uploads/1/3/0/5/130539090/70915b93.pdf
    • http://www.storylabinfographic.com/uploads/1/3/0/6/130604532/mopojuloxilutusud.pdf
    • http://wcd-qnv77h4.mgh-r.ch/uploads/1/3/0/5/130588956/130588956.html#reduce+the+size+of+a+pdf+document+mac

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f27.bin
5123954d01ff2d38110bbfc09c574e15fba1586baec5ba26eb1116134200a735		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2F27 8104 bytes

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