Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8163c5280e607c5…

MALICIOUS

PDF

73.5 KB Created: 2020-11-26 05:58:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcb985fe32caf1b8cf667ea4fb960bd1 SHA-1: 53c45779a6682dd302c82fab3bf0f2ba03d801f5 SHA-256: e8163c5280e607c5185dce25e7bda1afc96db4c3e8be41dbfe8818afd1c32a55
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL pointing to a suspicious domain. ClamAV and ML classifiers strongly indicate maliciousness, classifying it as a phishing trojan. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO-optimized PDFs that can serve as lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/strik?utm_term=how+to+cite+a+song+mla+8+in+text
    • https://cdn-cms.f-static.net/uploads/4370307/normal_5f9f410c2e55c.pdf
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/lorubavevotu.pdf
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/7702792.pdf
    • https://xiliperudal.weebly.com/uploads/1/3/3/9/133999468/vozumumo-fokokos-mejolep-lujajedivubi.pdf
    • https://volejodanuba.weebly.com/uploads/1/3/4/5/134593723/sikuzeri.pdf
    • https://fukoxifixe.weebly.com/uploads/1/3/4/4/134460993/8282f1d034.pdf
    • https://katolafafesol.weebly.com/uploads/1/3/4/4/134479470/6ceb899fde.pdf
    • https://cdn-cms.f-static.net/uploads/4427504/normal_5f9aef8dab438.pdf
    • https://mamunazeve.weebly.com/uploads/1/3/0/8/130814121/9500420.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fajeloninesitel/14335061572.pdf
    • https://uploads.strikinglycdn.com/files/f22a22e2-e8ef-454e-b2f0-2f47cd067282/puerto_morelos_real_estate.pdf
    • https://uploads.strikinglycdn.com/files/0d12244e-75d3-4580-9a9e-5dc4a384632e/reggio_emilia_vs_montessori.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_off0000e3c1.bin
253b416e0fdc018631b9c6b28a721f3271fbeaceaed7c6da498dfb8c6c6d1bd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C1 5336 bytes
font_01_sfnt_off0000f5f0.bin
26e54c3dde14fe3271c7f73202c17fb0d499ad1dd2a20751da28c215544b6bb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F0 10692 bytes

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