Malicious PDF — malware analysis report

Static analysis result for SHA-256 075fb620a6e7b0a9…

MALICIOUS

PDF

70.3 KB Created: 2021-02-27 10:56:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ad020d18880eb02145d8a817b42057ee SHA-1: 587dd892a42ffc6ac6ee81cba279e3d758cec8bd SHA-256: 075fb620a6e7b0a9b0c043b79f28ebdea419bd63ab4870d39d431ecef01a0235
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/aws?utm_term=with+the+old+breed+at+peleliu+and+okinawa+audiobook PDF link annotation
    • https://cdn.sqhk.co/kixobaza/10cibTi/19545457818.pdfIn PDF document text
    • http://hookup153.site/26292360115s8517.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494893/normal_5ff191e511382.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499285/normal_5ff4ccc7bdc67.pdfIn PDF document text
    • https://nimaxosonoj.weebly.com/uploads/1/3/4/8/134897368/fekajimuvuwizurutelo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443602/normal_6036c79724f71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476783/normal_5fe0ecd66c937.pdfIn PDF document text
    • http://begemot.space/47736518302c9h23.pdfIn PDF document text
    • http://wavakidagipav.iblogger.org/neresow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tarajix/mazexiwodatinarereguseb.pdfIn PDF document text
    • http://wevedikelu.epizy.com/commercial_kitchen_vinyl_sheet_flooring.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD713 5176 bytes
SHA-256: 38ca8b42eb8555b421fb4c6c6fafe7e66dfb678b54604d21df5ad97b75d2550f
font_01_sfnt_off0000e8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B7 10372 bytes
SHA-256: 251d4f685a5d3610c74154456a76ae352b817f5d09ffe09ba670cac1bda2025d

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