Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd1721cb6b9c6ad…

MALICIOUS

PDF

69.2 KB Created: 2021-04-02 08:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3eda7a48febe1a0413a597b967c95e9f SHA-1: db3e63897e6cc231f2860b4b5178ac07b98dcb76 SHA-256: 4bd1721cb6b9c6adecabc4c25a87d55c936cfd58f873416026b3a708609fc1cb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are to unknown domains and appear to be part of a link farm designed to obscure malicious destinations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=2016+ram+sport+owners+manual
    • http://mkr-olimp.info/66928870282h4enr.pdf
    • http://farotosinotom.mywebcommunity.org/17734763599.pdf
    • http://roxelejabojafe.scienceontheweb.net/can_am_outlander_maintenance_cost.pdf
    • https://cdn-cms.f-static.net/uploads/4413370/normal_60282f967d822.pdf
    • http://beliyden.xyz/fomokuzejifilogefokaboenev5.pdf
    • http://volosaty100.xyz/99367831918xmsb2.pdf
    • http://damita.fun/instant_pot_vegetarian_cookbook_amazonp152y.pdf
    • http://sakaxek.mygamesonline.org/bijolezixomimozezutisu.pdf
    • https://static.s123-cdn-static.com/uploads/4502246/normal_5fef4c32f27ad.pdf
    • http://prizinsta24.site/what_is_the_ending_to_defending_jacobro9ev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e5aadbcf-511f-4ee2-989a-4410a22eeed0.filesusr.com/ugd/64930c_cef8baa5ab8b46e089491d8c24ca06df.pdf?index=true
    • https://901b9152-9067-49c5-8541-bb90c1a77dfa.filesusr.com/ugd/5d84e8_1fc2a229139049bfa0a162369b0118b5.pdf?index=true
    • https://01477de9-116b-42a6-a62c-54244336611e.filesusr.com/ugd/dea9e9_4c1938517ba14234a5acdbb6a0eb2366.pdf?index=true
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_dd51f67e9fe54fda835f66c547d3e1da.pdf?index=true
    • https://3cde87c3-25ab-478b-b58d-ba072f1c7540.filesusr.com/ugd/255d97_a701ebe10b404b38be13d7a981c9eb86.pdf?index=true
    • https://f9c380c0-3c9a-404e-8c76-a924832b335c.filesusr.com/ugd/9c8fb9_826831001d7c4aefa1dbe67d2a61794f.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbf5.bin
58348b54caefdb0feb58ce20c311bfb1c25914c79e49621c31a57af65fdf5b88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF5 5444 bytes
font_01_sfnt_off0000de70.bin
3ba2878414e4b0f6528ef4fbe19f3b15c369d6ce3916d142015eac040441ee2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE70 12728 bytes

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