Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e78b77bf0c016a8…

MALICIOUS

PDF

68.8 KB Created: 2021-04-07 01:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18ce78ddf7527f0eec364f4be9228517 SHA-1: 1d1a6cf5411d0a4e0a4b8c14954e9cf446b31566 SHA-256: 3e78b77bf0c016a8d3dfe8f94cb47e2c45841a1d62e29a2fd88384a6fa73bf76
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable or unknown domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.telluridescience.org/sites/default/files/tstc-applications/38780162719.pdf
    • https://extranet.blanchisserie-toulousaine-de-sante.com/sites/extranet.blanchisserie-toulousaine-de-sante.com/files/documents/justificatifs/29410319198.pdf
    • https://ambrose.edu/sites/default/files/webform/tinijozude.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/fifomibap.pdf
    • https://www.afscme65.org/system/files/webform/11173368180.pdf
    • https://www.visitsavannah.com/sites/default/files/webform/mubojezelu.pdf
    • https://ambrose.edu/sites/default/files/webform/46846662681.pdf
    • http://www.pacificsportfraservalley.com/sites/default/files/webform/joxelivoresilawefuxeli.pdf
    • http://www.grotekeukens.be/sites/default/files/webform/gmawards2018/84972388600.pdf
    • http://spotlight-sites.com/sites/default/files/webform/loboje.pdf
    • http://pilgrimland.com/sites/default/files/webform/resume-uploads/52872338461.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=andorra+map+pdf
    • https://www.vub.be/sites/vub/files/webform/pagilavamuvawasaxega.pdf
    • https://gradfutures.princeton.edu/system/files/webform/fumegefexuwonadijot.pdf
    • https://thesanfordschool.asu.edu/sites/default/files/webform/lezedatabamivija.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2ad.bin
d31dfa8352ec06d8cb3ee87dcf3d49d962c7d411144b99aa47d1bbfbf099795d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AD 4968 bytes
font_01_sfnt_off0000e37d.bin
d6a443587329c30ed631467653d7bd216d69cbadc860fffca946a6b5b70d44b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE37D 10584 bytes

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