Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1226fbbd6ceb18…

MALICIOUS

PDF

72.1 KB Created: 2021-03-22 20:38:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3c9d88d5ba17effbbe9c8c7886005e6e SHA-1: 25f8f18ef24a08f30fb24cb4fe22d2aa4083a551 SHA-256: 4f1226fbbd6ceb186418f852bb09c3b716818688083efa1ebc25dfd12c6257cd
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The ML classifier strongly indicates maliciousness, and the PDF contains numerous embedded URLs pointing to disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true malicious destination by using many low-reputation domains. The document body, though heavily obfuscated, contains metadata related to PDF creation and potentially keywords that could be used in a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vilenefex.ru/wix?keyword=inverse+functions+worksheet+algebra+2 PDF link annotation
    • http://rujisuki.mygamesonline.org/16838087437.pdfIn PDF document text
    • http://nuwevabufa.mypressonline.com/audio_amplifier_schematic.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485442/normal_5ff4f02ca54ea.pdfIn PDF document text
    • http://zofiziz.getenjoyment.net/20519818743.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405642/normal_5fc5bb13e7a7b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388824/normal_600582bbe83d7.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/mathematics_of_finance_8th_edition_zima_brown_kopp.pdfIn PDF document text
    • http://pupezawat.scienceontheweb.net/relion_prime_test_strips_india.pdfIn PDF document text
    • http://melowimaz.getenjoyment.net/d_d_expert_set.pdfIn PDF document text
    • http://banademebilite.sportsontheweb.net/lenovo_t430_intel_core_i5-2520m_specs.pdfIn PDF document text
    • http://namafafiteg.mypressonline.com/bible_quiz_questions_and_answers_from_genesis_to_revelation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410190/normal_603164bc73c30.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/25731389851.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/calabozos_y_dragones_3._5.pdfIn PDF document text
    • http://nusowutevu.getenjoyment.net/lunoruvifasi.pdfIn PDF document text
    • http://niburufajanuto.sportsontheweb.net/fagobuzi.pdfIn PDF document text
    • http://gopudumimipabol.mypressonline.com/32278805342.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/wulagisi/wudazojosanalu.pdfIn PDF document text
    • http://nopugorib.onlinewebshop.net/45150859981.pdfIn PDF document text
    • http://dozopedatofol.atwebpages.com/difference_between_bipolar_1_and_2.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/kolatuvig.pdfIn PDF document text
    • http://vexabimumemig.atwebpages.com/nedaviburege.pdfIn PDF document text
    • http://jabodegodonirad.atwebpages.com/tiger_rice_cooker_jbv-a10u_instructions.pdfIn PDF document text
    • http://rabatelekovufar.myartsonline.com/movikavibasug.pdfIn PDF document text
    • http://satogitexuvo.myartsonline.com/82699610620.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_off0000db1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1B 5568 bytes
SHA-256: 874fbd08ef011ea0143dcec767bc3b33777554e306b0349d9205a0408fc5ed35
font_01_sfnt_off0000ee29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE29 10600 bytes
SHA-256: b210557c3cfcd1439ac0de93d734c12b4b472e4a92cf6ed5d190e0b0d68b0d6c

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