Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4bc303d4eebc71c…

MALICIOUS

PDF

71.3 KB Created: 2020-11-12 13:49:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fc20636534b0dba7ca81970245dfb81 SHA-1: 939ffb28973a78611c3c02c381770599b3a6beb9 SHA-256: e4bc303d4eebc71c41b00664ccf5a3227dd4085ce534271bcdb2f75a7f09261a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malicious redirection attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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://trafffe.ru/aws?utm_term=capacitor+esr+datasheet
    • https://gozuvixonoj.weebly.com/uploads/1/3/4/5/134517501/vurajupoxovum.pdf
    • https://wozofawado.weebly.com/uploads/1/3/0/8/130874325/32b02d.pdf
    • https://butiziro.weebly.com/uploads/1/3/4/3/134308177/zanerexutasuvepadubi.pdf
    • https://cdn-cms.f-static.net/uploads/4413697/normal_5fa62a60e05ab.pdf
    • https://devuzagobeli.weebly.com/uploads/1/3/4/4/134431767/ramefezawegate.pdf
    • https://cdn-cms.f-static.net/uploads/4389095/normal_5f8e7e9445ee0.pdf
    • https://cdn-cms.f-static.net/uploads/4496380/normal_5fabd17277a6e.pdf
    • https://neboxikadifi.weebly.com/uploads/1/3/4/5/134588308/9302589.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jesidofefe/fort_lauderdale_high_school_staff_directory.pdf
    • https://uploads.strikinglycdn.com/files/c514a704-7c9d-4ce2-9f74-61f01533dfa2/mega_man_11_boss_weakness.pdf
    • https://uploads.strikinglycdn.com/files/f7136097-2cc3-418b-8d5b-aacae608b784/zasogugajigowiforisu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf5c.bin
65fd6c932373b2fde0463be9a5bc0ae68bef55f81c95be12be6787aa5596b205		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5C 4836 bytes
font_01_sfnt_off0000dfdb.bin
7f43d4e58e38f8afadc0559c7bd211965029d78b02600863f1ed48d92c4f1ae9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDB 10576 bytes
font_02_sfnt_off000102ed.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102ED 4324 bytes

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