Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0ebc16f76f3c66…

MALICIOUS

PDF

70.8 KB Created: 2021-04-06 23:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9025dc5699232039af658b06c6092ece SHA-1: a6c176735b05657a42474f6efbc067331972cdd6 SHA-256: ac0ebc16f76f3c660d43dbc6385799f9452dd4c04bc403766fd47db3ddcb9d31
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to domains that appear to be part of a link farm, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or a scam. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9656

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://klm3fg.grhosting.cz/sites/default/files/webform/files/78191676466.pdf
    • https://aboss.by/sites/default/files/webform/tatesejozamelifat.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/17232120942.pdf
    • http://spotlight-sites.com/sites/default/files/webform/loboje.pdf
    • https://web.liderpapel.com/sites/default/files/webform/53484808665.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/19824170549.pdf
    • https://www.cdcplumbing.com/sites/default/files/webform/contact-us/sawifujemenolezaf.pdf
    • https://europa-ts.ru/sites/default/files/webform/totikejeropisatuzubafaba.pdf
    • http://www.guninetwork.org/system/files/webform/heirri_proposals/35039450578.pdf
    • https://www.telluridescience.org/sites/default/files/tstc-applications/kuvusuwube.pdf
    • https://vectorcorp.net/sites/default/files/webform/resume/sowasipaxezok.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/68038126183.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/68138040624.pdf
    • http://www.pacificsportfraservalley.com/sites/default/files/webform/zajufofagobixipisuna.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=cannulation+procedure+pdf
    • https://www.healthdata.org/sites/default/files/resumes/53082175038.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7d3.bin
8ad1e59f08471aebb2e978a9695127a0f27c67f925d98062afe888de769493e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D3 4876 bytes

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