Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb7746b2e8bd7a0…

MALICIOUS

PDF

89.6 KB Created: 2021-01-31 16:51:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a8119c9059a29bcc299f1b4364c11bfc SHA-1: 350779bf1b0e5bba6fd669dea1a718be2b00d6bc SHA-256: 6fb7746b2e8bd7a039c40cb3db8c2aa781622bac3a18974dfb20a8f8c64ffff9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of many external URIs suggests the document's primary purpose is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://jacksth.ru/123?utm_term=crkveni+kalendar+2019+novembar PDF link annotation
    • http://spain50off.info/88282889845o5mc7.pdfIn PDF document text
    • https://cdn.sqhk.co/maweveju/ehjjhWx/91645712570.pdfIn PDF document text
    • http://fokikizuxijem.iblogger.org/harrogate_borough_council_recycling_guide.pdfIn PDF document text
    • http://naturmilans.fun/fardeleuse_automatiquera2ih.pdfIn PDF document text
    • https://xibutunu.weebly.com/uploads/1/3/4/0/134017024/tibubetogavazujude.pdfIn PDF document text
    • http://216tilford.com/tebevopigipazosivifxud.pdfIn PDF document text
    • http://scrlt.xyz/nazarick_all_floors_minecraft_map_do03tbu.pdfIn PDF document text
    • http://xosuvirakogaf.iblogger.org/inverse_trigonometric_functions_integration_worksheet.pdfIn PDF document text
    • https://vixugusimuxomuj.weebly.com/uploads/1/3/0/9/130969476/1836ee99d.pdfIn PDF document text
    • http://starkrobotics.org/3189333617582vtf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buwepuxaj.epizy.com/17678910128.pdfIn PDF document text
    • http://napilidowolaro.rf.gd/multiples_worksheets_grade_7.pdfIn PDF document text
    • http://sinalowus.epizy.com/corneal_ulcer_nice_guidelines.pdfIn PDF document text
    • http://namutogenasokab.epizy.com/6807636941.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_off00011b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0B 5444 bytes
SHA-256: 0367cbb53bfaffdb979e62247a516ce3a909a3a8ba88e893160950b9e7a9d3a7
font_01_sfnt_off00012d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7A 14492 bytes
SHA-256: deb10026f37953d89eb6a18e9dd5ea299e1d6f4609dbf690537d8eace7ad16b7

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