Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f793081003a5cda…

MALICIOUS

PDF

68.8 KB Created: 2021-03-04 18:37:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 234a6569600ab2e70146b84f09fbbcd0 SHA-1: f51eabc958baeb1d36857a4e3c7cd5bfd6d8617f SHA-256: 4f793081003a5cdab20a976c375c38a8d6dec061cdcd2ba2a87feea276e3d77a
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting and has been flagged by ML classifiers and ClamAV as malicious. The embedded URL points to a domain associated with phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to malicious content.

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://jumiwimov.ru/wix?keyword=reproduction+vocabulary+worksheet PDF link annotation
    • http://gilumesu.mypressonline.com/ionic_breeze_gp_s1730.pdfIn PDF document text
    • https://boxenujanazikof.weebly.com/uploads/1/3/5/3/135302290/5142242.pdfIn PDF document text
    • http://pedugubugof.mywebcommunity.org/daxikoserewezodepanodavu.pdfIn PDF document text
    • https://nitikado.weebly.com/uploads/1/3/4/6/134660078/a9db99c87ea3.pdfIn PDF document text
    • http://lazirog.mywebcommunity.org/wotexazekenegojanak.pdfIn PDF document text
    • http://xamoxipuwizutux.scienceontheweb.net/how_much_is_my_disney_collectible_worth.pdfIn PDF document text
    • http://retamos.mygamesonline.org/samsung_smt-i6021_factory_reset.pdfIn PDF document text
    • https://dopijixofovaje.weebly.com/uploads/1/3/4/6/134692352/7625057.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/rekawexuretowo/77789427472.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/tubewinoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/666e8c48-5c4a-4094-a95e-540c7dce9091/10781224321.pdfIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_b93553b72940428ab758153e48e1e382.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d87a66a9-e7b8-4728-b8fc-76106cab4307/how_to_change_oil_on_yardman_snowblower.pdfIn PDF document text
    • http://peledopa.myartsonline.com/die_kleine_raupe_nimmersatt_buch_online_lesen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c475149b-5013-4210-b62f-98d4376a9b5b/proform_14.0_ce_elliptical_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/medical_certificate_sample_form.pdfIn PDF document text
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_a91c046ec0504010923f6e0a5497c7b4.pdf?index=trueIn PDF document text
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_2e103dae0da94e02b7f1026eeedf758f.pdf?index=trueIn 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_off0000d191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD191 5624 bytes
SHA-256: 62d2ffc072783896a64f15fc3680b6c18271449b36eb46916cd6614eecf60d4f
font_01_sfnt_off0000e4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BE 9784 bytes
SHA-256: 019ca55049e0e6e5f22d382f548b4566e634bd7308252661de381947f93fe7fe

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