Malicious PDF — malware analysis report

Static analysis result for SHA-256 b20a87d654a95892…

MALICIOUS

PDF

43.1 KB Authoring application: QPDF
MD5: e4fbbd6672b9f3959d471f8b86d58df2 SHA-1: f22ee9c7f3ab390d4a37133e3e66912c5e7cb909 SHA-256: b20a87d654a95892b1f0e6cd0e98085fba87572e00fe72eeeac72c46d0a7e819
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links to other PDF files hosted on various domains. This "link farm" technique is often used to obscure the ultimate destination or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these linked PDFs.

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://oscarchavezphotography.net/uploads/1/3/0/2/130272325/sifapenuwoje-kamuzalunegoveb-makuzifoxerozi-babodej.pdf
    • http://qtsatelier.com/uploads/1/3/0/4/130483479/2327859.pdf
    • http://salftom.store/uploads/1/3/0/6/130603853/9747588.pdf
    • http://lovefail.net/uploads/1/3/0/5/130551053/reruzaxodaner-xanasanojaxuti.pdf
    • http://txinvite.com/uploads/1/3/0/6/130604728/sufifowakefubib.pdf
    • http://mx.lucasilieconstruction.com/uploads/1/3/0/4/130483918/3083836.pdf
    • http://www.deltaaviationoxygen.com/uploads/1/3/0/6/130621818/8898379.pdf
    • http://cheaptokeeptrees.org/uploads/1/3/0/4/130476502/fd79a560.pdf
    • http://sinofusionrestaurant.com/uploads/1/3/0/5/130590661/eab3f2e157ab5.pdf
    • http://blog.easymathapp.com/uploads/1/3/0/4/130483350/9476289.pdf
    • http://hammerandsonsconstruction.com/uploads/1/3/0/5/130544938/lukozupo.pdf
    • http://blakewitsman.com/uploads/1/3/0/6/130604871/9498692.pdf
    • http://mackmccullough.com/uploads/1/3/0/5/130588721/vutekasikurivuko.pdf
    • http://peopleandpipelines.com/uploads/1/3/0/3/130313370/kunisutepubujozoge.pdf
    • http://animazioneteatrale.com/uploads/1/3/0/7/130739261/7989239.pdf
    • http://nomnomgelato.com.au/uploads/1/3/0/5/130551089/6728fcc972.pdf
    • http://world-store-line.site/uploads/1/3/0/6/130639753/zixoroled-jelatefira-nedetawepoguren.pdf
    • http://nuecescanyonlodge.com/uploads/1/3/0/2/130289662/xoroxelagaxi.pdf
    • http://crankybaker.com/uploads/1/3/0/4/130489361/kexonix.pdf
    • http://hall-elopement.rominastiebenphotography.com/uploads/1/3/0/5/130541924/130541924.html#examples+of+communism+socialism+and+capitalism
    • http://cheaptokeeptrees.org/uploads/1/3/0/4/13047

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003452.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3452 16036 bytes
font_01_sfnt_off00004b07.bin
3dc42baa66c3e28fcdb0e15bf331fc71ffef95e89bab053e3ba6e6abef7c0dd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B07 7436 bytes

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