Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c083f4cc222f016…

MALICIOUS

PDF

73.3 KB Created: 2020-11-21 09:59:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49e3db6ae2daaebcfd077a39e597d182 SHA-1: 5e4fb0d630d444e36d57bc2c3e69b0b4fd49c033 SHA-256: 2c083f4cc222f016aef1c20008d2d1c65e85391fd4a4073c95e8c7f9ffff3cf5
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous external URLs embedded within it, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving redirection to potentially harmful content.

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-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://traffset.ru/123?utm_term=judith+ortiz+cofer+american+history
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/zilageponege.pdf
    • https://cdn-cms.f-static.net/uploads/4379491/normal_5fad79558f216.pdf
    • https://cdn-cms.f-static.net/uploads/4404984/normal_5fb76a42124d1.pdf
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/10d189f3fb6fc4.pdf
    • https://cdn-cms.f-static.net/uploads/4446285/normal_5faf01bf8a3eb.pdf
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/5088566.pdf
    • https://xusawoji.weebly.com/uploads/1/3/0/7/130739635/7122096.pdf
    • https://mogawurid.weebly.com/uploads/1/3/4/0/134042680/vidomi.pdf
    • https://deroguba.weebly.com/uploads/1/3/4/6/134684347/4524854.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tosevud/72292298580.pdf
    • https://uploads.strikinglycdn.com/files/f47e6a78-904b-4207-9032-8600d4c284bc/17826543142.pdf
    • https://s3.amazonaws.com/wusigipufuvowix/47678902217.pdf
    • https://uploads.strikinglycdn.com/files/9f6d2578-c111-47e3-8ef5-3a134864ad98/zokubitixujiwitogilesaxe.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_off0000e08d.bin
aa196547876077438cd43686b83c01209fba5c34cbdb430e8ae22cbefe6ce129		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE08D 5372 bytes
font_01_sfnt_off0000f2b6.bin
898ec86bb4c47858ff4f202cd5505bdeeb41d69e7a317486f6d179d5cbb8a7ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 11436 bytes

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