Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92b7640d095f498…

MALICIOUS

PDF

71.3 KB Created: 2021-03-28 13:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f879ed955f68d9a3834fa7c6c1485f1a SHA-1: 70db54126dbaa6a827d09e819d1fd3af79015b51 SHA-256: f92b7640d095f498c34d63acb4f51138f662c583fc1dd0f76ba707cfdd81f19e
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term=printable grammar worksheet grade 5' in a URL indicates a lure to disguise the malicious intent.

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://vilenefex.ru/123?utm_term=printable+grammar+worksheet+grade+5 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409799/normal_6052831f31663.pdfIn PDF document text
    • https://falatunasozenu.weebly.com/uploads/1/3/4/7/134762474/a580cf5e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366408/normal_5fd995247b078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403422/normal_604931b7d5a14.pdfIn PDF document text
    • http://trendmobile.ru/949144314161hecr.pdfIn PDF document text
    • https://rejileju.weebly.com/uploads/1/3/4/3/134335231/420a921a9ce19.pdfIn PDF document text
    • http://healsmall.space/erasmus_darwin_academy_uniformxtzo0.pdfIn PDF document text
    • http://dadevizevarek.scienceontheweb.net/capital_markets_analyst_salary_jll.pdfIn PDF document text
    • http://megatorg.ru/2002_toyota_echo_stereo_wiring_diagramfkvwu.pdfIn PDF document text
    • http://degimogug.mypressonline.com/gipizedadizejofugutawiwoj.pdfIn PDF document text
    • http://rinujajija.getenjoyment.net/16267679313.pdfIn PDF document text
    • https://xapabareduvan.weebly.com/uploads/1/3/4/3/134395213/finetudak-revigujuzetuw-nogebubenetu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tediguku.atwebpages.com/corsair_k95_gaming_keyboard_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbcb6c26-86b7-4413-a6a5-cea7b11265ad/gotumadobezetufokavufulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67f08716-4e76-4282-8621-d884d6a8809d/nagiwimimo.pdfIn PDF document text
    • http://tuminexozuvino.atwebpages.com/asciidoctor_install_ubuntu.pdfIn PDF document text
    • http://dokudaruriwiv.atwebpages.com/life_or_death_michael_robotham_free.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_off0000d897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD897 5660 bytes
SHA-256: c22bfe9013b627a9718124c465453a77863e7a5cf74082a614ea11da688cc559
font_01_sfnt_off0000ebbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBE 10708 bytes
SHA-256: 846d7f93c8e37c0b7d068b5197dedf562e76910d0eb48329043ca6e75dbb1a75

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