Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12695616088df9a…

MALICIOUS

PDF

63.6 KB Created: 2021-04-19 22:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97cd0a6d50a715bb6b171bff5791f0a2 SHA-1: 0446086e778d0d2e8bf863a015d4e9d1e8dd010c SHA-256: b12695616088df9a372cb9f528c90213fcdd8eab117466b2ec5c5f393f053702
124 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The document contains numerous embedded URLs, many of which point to disposable or unknown domains, suggesting a link farm designed to obscure the final malicious destination. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely to redirect users to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9680

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://www.guninetwork.org/system/files/webform/heirri_proposals/80098342864.pdf
    • https://www.blplegal.com/sites/default/files/webform/vogelunejubujapezidugave.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/90018929780.pdf
    • https://www.jwico.com/sites/default/files/webform/minokoniniwige.pdf
    • https://ambrose.edu/sites/default/files/webform/46846662681.pdf
    • https://www.woonsocketri.org/system/temporary/webform/mupiroto.pdf
    • https://www.blplegal.com/sites/default/files/webform/pifijolaj.pdf
    • https://www.dgs-interparts.be/sites/default/files/57515461030.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/65810703597.pdf
    • https://ambrose.edu/sites/default/files/webform/61928937085.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/bekam.pdf
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/96392425525.pdf
    • https://extranet.blanchisserie-toulousaine-de-sante.com/sites/extranet.blanchisserie-toulousaine-de-sante.com/files/documents/justificatifs/6659556688.pdf
    • https://www.uts.cw/sites/default/files/webform/89737617204.pdf
    • https://web.liderpapel.com/sites/default/files/webform/21411595718.pdf
    • https://www.woonsocketri.org/system/temporary/webform/bogobovimefegaf.pdf
    • https://europa-ts.ru/sites/default/files/webform/6529842099.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=sharepoint+2019+training+online+free
    • https://printandmail.princeton.edu/system/files/webform/ziwilijevugibapuvoboka.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd71.bin
19aca841312af3c37849262eba2a86044be9c81aee4e83cae6c917a3085e3d77
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD71 5568 bytes
font_01_sfnt_off0000e067.bin
cfa7996085289ec621aca55d9ef0682bfc521b0ee21bd71f13e4c402b2f1ae8f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE067 10340 bytes