Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c29c241b6b48d38…

MALICIOUS

PDF

78.4 KB Created: 2021-03-23 23:24:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3988c998f34f98c816cf7daf3f4dc4cd SHA-1: 3f41bccc346e6163a38370ee064fcba2989fa9cf SHA-256: 4c29c241b6b48d3859e559a4b27948f9807a3127c7ad2eb5d07bf75e27aa15b5
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a high heuristic score indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document body, though partially corrupted, suggests a lure related to downloading a book, directing users to URLs like https://vilenefex.ru/award?keyword=arrancame+la+vida+libro+pdf+descargar.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/award?keyword=arrancame+la+vida+libro+pdf+descargar PDF link annotation
    • http://bottlechainworld.com/international_business_salary_in_canadakgwls.pdfIn PDF document text
    • https://cdn.sqhk.co/pabopimi/Njihjjf/guzisori.pdfIn PDF document text
    • http://xikisavi.scienceontheweb.net/haier_portable_air_conditioner_drain_hose.pdfIn PDF document text
    • https://porovepo.weebly.com/uploads/1/3/4/5/134527374/5b3e26.pdfIn PDF document text
    • https://cdn.sqhk.co/pozedezupase/ghngheU/72457094261.pdfIn PDF document text
    • http://specialsale.info/nike_infant_footwear_size_guidejszju.pdfIn PDF document text
    • http://mavito.online/how_to_download_and_install_plugins_in_fl_studio_20y8hda.pdfIn PDF document text
    • https://julitigifoxa.weebly.com/uploads/1/3/4/3/134310533/kebifavaj-jenoregotanaduz.pdfIn PDF document text
    • http://luziniwanemek.sportsontheweb.net/44965108077.pdfIn PDF document text
    • http://myfavoritesun.xyz/48649398006bk52e.pdfIn PDF document text
    • https://cdn.sqhk.co/nagebagem/8jdIyhh/the_hangover_baby_gif.pdfIn PDF document text
    • http://meblik.su/sedomosapex210a.pdfIn PDF document text
    • https://cdn.sqhk.co/zaweniwefi/ihfrqjM/bisaluba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f495c71d-628d-4070-9a3d-b699cbb46ba4.filesusr.com/ugd/d99ef3_679868d3fd7140daab2ccf8048fa3b4c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/488de882-6b2b-483f-a1a1-6b148e715129/wirenonelamefir.pdfIn PDF document text
    • http://zukomakiduw.myartsonline.com/schaum_s_outline_of_bookkeeping_and_accounting_fourth_edition.pdfIn PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_6bb2b177cfc043b08fdcc1b4f8e018a5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e706570c-4555-442d-b2df-adc28bb0acd5/99473829287.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b189e0df-71e2-44bb-9739-c237c82aac6d/los_atributos_de_dios_segun_la_biblia.pdfIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_4bac850c49d546c6b969bdaf236e8704.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e47518db-f4c5-4df4-8faa-710c6587cc19/witcher_2_netflix_date.pdfIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_ac38a1aeb97049a3861999a06ced74aa.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_off0000ef58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF58 5664 bytes
SHA-256: 3dfbaf45ec4ec6be8d391d0c476a2d0f52796c8f13a15bdd83d194bf5b11d71a
font_01_sfnt_off00010288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10288 12316 bytes
SHA-256: f14e76de2ee46e7bfd50801af82f50e73fe8155862c43025bac73b7be9d30bca

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