Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e79ff8e8f5e11d1…

MALICIOUS

PDF

59.5 KB Created: 2020-12-05 12:04:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87bbfac125220e9ed246401f1b3915bd SHA-1: 197aaef1d4ed893afb3957d355872b9023b322e0 SHA-256: 1e79ff8e8f5e11d18346d8265b8264c7f3d1428caa0ec177f98fcaf8226825ce
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, directing users to various domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and external links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/strik?utm_term=chapter+3+parallel+and+perpendicular+lines+holt+mcdougal
    • https://cdn-cms.f-static.net/uploads/4381759/normal_5f8e951c65e1c.pdf
    • https://cdn-cms.f-static.net/uploads/4379984/normal_5fb2c1a369c1f.pdf
    • https://cdn-cms.f-static.net/uploads/4489033/normal_5faf94f0beaa6.pdf
    • https://wofenexezut.weebly.com/uploads/1/3/4/3/134310974/ffddd8a.pdf
    • https://cdn-cms.f-static.net/uploads/4410731/normal_5fae8a7c61dcd.pdf
    • https://miremewokar.weebly.com/uploads/1/3/0/7/130738658/2458690.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe13eaf8cdb769c6ab0f85/1606292459186/apex_manual_detergent.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd01373ca23154c95c124a/1606222137148/95649068099.pdf
    • https://uploads.strikinglycdn.com/files/e9374d67-f449-460b-a881-72fc5178bc6e/dazuxupisokaworatetomo.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_off0000abd2.bin
cdac8b959702e6662166d3759b96e33b62e4a16ad2e4148460ea1b467a55baf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABD2 5556 bytes
font_01_sfnt_off0000be84.bin
26b779eae86550fb4365d2ea215e845bb5c8a49b401b49604a188e97d8229880		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE84 10176 bytes

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