Malicious PDF — malware analysis report

Static analysis result for SHA-256 426bef7bc3d0bfd0…

MALICIOUS

PDF

81.3 KB Created: 2021-03-30 13:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e6e84aebabceb8f059fbb76e4761e39 SHA-1: 1febeda4e2db8b87fb4047667c5a736f6008d8d1 SHA-256: 426bef7bc3d0bfd04f57cadd16534a1cd229e604ca676976e52cb55dfae7ceb6
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. The document body, though heavily obfuscated, contains text related to 'trinity rescue kit' and the authoring application, suggesting a lure to a malicious site. The presence of numerous external URIs indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/wix?keyword=how+to+use+trinity+rescue+kit
    • https://static.s123-cdn-static.com/uploads/4366369/normal_5fed01d5b2866.pdf
    • https://natevifenug.weebly.com/uploads/1/3/5/9/135986161/c77c3e6a.pdf
    • https://cdn.sqhk.co/nebemina/iUjihjd/stellar_hunter_gifts.pdf
    • https://cdn.sqhk.co/nesuxozajek/Whilih6/85759535868.pdf
    • http://kuvenumine.mygamesonline.org/86310277592.pdf
    • https://cdn-cms.f-static.net/uploads/4403263/normal_602ce334ec1b5.pdf
    • https://cdn-cms.f-static.net/uploads/4485004/normal_603373657041a.pdf
    • https://gadonivoxe.weebly.com/uploads/1/3/5/3/135331758/144687.pdf
    • http://lakujalinifibo.mypressonline.com/arabinose_operon.pdf
    • https://cdn-cms.f-static.net/uploads/4466675/normal_602f1b6b1051c.pdf
    • http://mavaxur.mywebcommunity.org/az_203_download.pdf
    • https://sarowamirubene.weebly.com/uploads/1/3/4/7/134736793/bubijiritul.pdf
    • https://cdn.sqhk.co/xexerekija/gtjhjiv/kikurunanose.pdf
    • https://votivugaxowo.weebly.com/uploads/1/3/1/1/131163932/4fda96.pdf
    • http://xagixowedobosab.medianewsonline.com/27433103045.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d3480160-c89f-4b6c-9618-539da0592d33/86642358739.pdf
    • http://kepawomokatuke.myartsonline.com/16252099520.pdf
    • https://uploads.strikinglycdn.com/files/b7d53857-7919-4d09-b848-07419f8273fa/quadrafire_1200_pellet_stove_manual.pdf
    • http://saluwagasa.onlinewebshop.net/cant_open_washing_machine_door_bosch.pdf
    • http://bifiwapaz.onlinewebshop.net/lomurimirisaginex.pdf
    • https://uploads.strikinglycdn.com/files/57481fbd-b593-4c4f-a4ee-5a38415a909e/83576017824.pdf
    • 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_off0000fd05.bin
f9cf24599e875eb4aaa444b40ff693ead73d069f8af340f466879e8b6dfd849d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD05 4772 bytes
font_01_sfnt_off00010d69.bin
dd40e8835e478cddd8b4c92e61fbe9d011e11b7005a97711f79e144b13bb18c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D69 11984 bytes

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