Malicious PDF — malware analysis report

Static analysis result for SHA-256 591a541e61d857c3…

MALICIOUS

PDF

91.2 KB Created: 2021-03-15 22:27:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8b9cf573727d4319bff977d7a7ed073a SHA-1: 3650d4fe80c2780ddd653b02854e31f1d4d8bb9f SHA-256: 591a541e61d857c3d4eebb2394f610392d377f49eb876a0b0fdd5ca8eae9ae08
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, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/wix?keyword=kenickie+murdoch+real+name PDF link annotation
    • https://cdn.sqhk.co/madobeborozu/WFgiomm/vafevunesasokuze.pdfIn PDF document text
    • http://fajufoturesu.sportsontheweb.net/biodegradable_plastic_download.pdfIn PDF document text
    • http://jarowulizose.sportsontheweb.net/bivezonokerolofelaki.pdfIn PDF document text
    • http://fagumawegoleleb.mypressonline.com/reservoir_capillary_pressure.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/suwalav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413455/normal_603f377588901.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405907/normal_601ba687124dc.pdfIn PDF document text
    • http://rigudozefogo.mypressonline.com/jevamizamokesak.pdfIn PDF document text
    • http://zajiledafalam.getenjoyment.net/27048491350.pdfIn PDF document text
    • https://cdn.sqhk.co/wusezofetib/hdgcjiT/microbial_ecology_is_the_study_of_quizlet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451950/normal_6010d2d892c34.pdfIn PDF document text
    • https://cdn.sqhk.co/luwivimexu/vqiiRia/explain_the_branches_of_psychology.pdfIn PDF document text
    • http://takipibimaxubov.sportsontheweb.net/pufisifasujemoxufituloj.pdfIn PDF document text
    • http://sazulido.medianewsonline.com/alto_shaam_halo_heat_error_codes.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/ge_universal_remote_auto_code_search_instructions.pdfIn PDF document text
    • http://rozewevojalel.sportsontheweb.net/82335825842.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404122/normal_5fdeb19c794e5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sogurorirerew.onlinewebshop.net/levunagomuriwig.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/baixar_dicionario_hebraico_portugues.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/34339872934.pdfIn PDF document text
    • http://nuzikenevizut.onlinewebshop.net/benim_hocam_trke.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/angular2_bootstrap_datepicker_reactive_form.pdfIn PDF document text
    • http://biburusig.myartsonline.com/pdf_candy_pro_version.pdfIn PDF document text
    • http://dexadusoxeb.atwebpages.com/catalogo_bujias_bosch_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/romezirarozajubuxazonibot.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_off00012900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12900 5036 bytes
SHA-256: ff134e399a277fdeb45140d2af4a2fcadce1f4b5b895cd29eb9b4e3163195fdb
font_01_sfnt_off000139f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F1 11196 bytes
SHA-256: 6f284385a3cac8c7bf69293d5d74cb2300ea7b25099c970d7e35f6ddd528ce98

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