Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc90ecd73c6b1e3…

MALICIOUS

PDF

70.5 KB Created: 2021-06-01 09:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 00a1ad6c8b670520dbb2622517f1ac9c SHA-1: b73fbce47ded1043975764108bf27c1afd45655f SHA-256: 3bc90ecd73c6b1e31b695d2ac6bff4de55edba0a0202cb95d592fadb30bfbd53
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominent URL pointing to 'crewmak.ru' and suggesting a software download. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous disposable hosting sites for links, further supporting a malicious intent to distribute content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://crewmak.ru/pbw?utm_term=microsoft+sidewinder+joystick+software+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375195/normal_5fce8e28e9f8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484633/normal_606378c4c2ec3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375344/normal_6057c19cc7c01.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4387577/normal_60b07fe608efe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453720/normal_5fcb66cf776d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408002/normal_6020604593f9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378406/normal_6007b67e740b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruwezebom.pbworks.com/w/file/fetch/144425055/desafio_del_amor_para_padres.pdfIn PDF document text
    • http://mizunebapod.pbworks.com/f/what_are_the_characteristics_of_information_security.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/f/vuvinu.pdfIn PDF document text
    • http://kiletejude.pbworks.com/w/file/fetch/144411600/the_ph_miracle.pdfIn PDF document text
    • http://pokuwatosat.pbworks.com/f/diodo_byv27-200_equivalente.pdfIn PDF document text
    • http://natizasex.pbworks.com/w/file/fetch/144411435/human_genetics_concepts_and_applications_12th_edition_by_ricki_lewis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a82ee44-c656-461a-8f93-92667dadb31d/passassured_top_300_drugs_quizlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7c3f31b-a70f-4c09-a437-168dbaa21ab9/how_to_get_iso_9001_certification.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/w/file/fetch/144449694/9912602118.pdfIn PDF document text
    • http://garigor.pbworks.com/f/86387308949.pdfIn PDF document text
    • http://zekodunu.pbworks.com/w/file/fetch/144442902/gorov.pdfIn PDF document text
    • http://xedidovetaw.pbworks.com/f/son_of_bigfoot_trailer_2018.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/w/file/fetch/144422877/how_to_measure_house_wire_gauge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5715b0f4-cd49-496c-9ac0-706274742150/1880475440.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_off0000d6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E2 5352 bytes
SHA-256: 88051e62cdcb2435979473aaa3d3d8acba4bf3e4263e29c417e500eac9d14338
font_01_sfnt_off0000e952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE952 10272 bytes
SHA-256: 3df4c1ef86930e008ec1a64392c82a3a9e711bc72d46ae33f57dfa66fcc16a43

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