Malicious PDF — malware analysis report

Static analysis result for SHA-256 065c4a90810b8376…

MALICIOUS

PDF

69.3 KB Created: 2021-04-19 17:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81e5e23e0292fc96234447e7659e6151 SHA-1: fb3d71b6e74736bdd1e45832d4de6753280e496a SHA-256: 065c4a90810b83767d9c32a460ef624065a303d3b461fd25ad95266a1ca406d6
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with several pointing to unknown or potentially malicious domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and heuristic firings point towards a common tactic of using embedded links to lead victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8793

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 https://www.woonsocketri.org/system/temporary/webform/mupiroto.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/21555212736.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/10654010608.pdf
    • https://ambrose.edu/sites/default/files/webform/rebunedirewe.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/mibotemesasis.pdf
    • https://europa-ts.ru/sites/default/files/webform/totikejeropisatuzubafaba.pdf
    • https://www.jwico.com/sites/default/files/webform/pagijan.pdf
    • https://vectorcorp.net/sites/default/files/webform/resume/danodajanenalidadalibebav.pdf
    • https://extranet.blanchisserie-toulousaine-de-sante.com/sites/extranet.blanchisserie-toulousaine-de-sante.com/files/documents/justificatifs/bugoxugokerudanetisene.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/39809543560.pdf
    • http://www.friendlycc.com/sites/default/files/webform/zuguxinukebezukul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=dream+of+best+friend+pregnant
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/86402477901.pdf
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/vojevo.pdf
    • https://campusrec.princeton.edu/system/files/webform/popikinof.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3f7.bin
4f2841092a98b7a6516e2d1c6a64e2f0dae3938e3712553814c29b70dcb976bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F7 5468 bytes
font_01_sfnt_off0000f67c.bin
a0b11bc06067ee5034fecd9ce6da7220a95f560f30f8b1ef1af272bfe5e3ff0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF67C 11176 bytes

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