Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c420e54b9bdc680…

MALICIOUS

PDF

86.1 KB Created: 2021-04-05 23:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 900aa41d6784240b84ceb0df45de3c62 SHA-1: 53e94e0822b28cdab3914f3078d9d6ee6ab9de2c SHA-256: 3c420e54b9bdc680dc39137a3b5aaeca283bd9768d804ca92330a40ff2d02e11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The presence of a large number of external links, including one to jumiwimov.ru, strongly suggests a phishing or link-farming attack designed to redirect users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jumiwimov.ru/123?utm_term=weekday+date+format+swift
    • https://vikisoxez.weebly.com/uploads/1/3/4/7/134712259/8820348.pdf
    • http://fegokodelaxen.scienceontheweb.net/automated_guided_vehicle_systems_ullrich.pdf
    • https://giruwaferelesed.weebly.com/uploads/1/3/4/8/134850821/kixulenolatikupamav.pdf
    • https://sakofavore.weebly.com/uploads/1/3/3/9/133997309/sofewuvugotob-forifu.pdf
    • http://wemuwetafivaxe.sportsontheweb.net/anarchy_workout_abs.pdf
    • https://subopojulolilat.weebly.com/uploads/1/3/4/3/134319837/7058588.pdf
    • https://jikegasabum.weebly.com/uploads/1/3/1/8/131856907/retujev-wunera-fekubimatajebo.pdf
    • http://ludirobus.getenjoyment.net/nanulujazupubolafanig.pdf
    • http://pekibexuvipeve.scienceontheweb.net/84480093788.pdf
    • https://kofeguku.weebly.com/uploads/1/3/4/5/134587943/nalujebalu.pdf
    • https://korisupugi.weebly.com/uploads/1/3/5/3/135308649/cb4bc41e23f39c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dc5ca969-d333-4582-9879-b719aca70d73.filesusr.com/ugd/760c43_09ff2efd5ab4462797fb96170acbebe1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8eeff8b4-2793-4c40-9fe9-86421dc56dca/dukakezunapaziwiso.pdf
    • https://uploads.strikinglycdn.com/files/f4d71137-0f49-48db-88dc-f28509eaae90/how_to_draw_radha_krishna_pencil_sketch_step_by_step.pdf
    • https://uploads.strikinglycdn.com/files/c71e99e6-6bca-4fba-91bd-e1bdff85c8cb/73477485214.pdf
    • https://uploads.strikinglycdn.com/files/ae02ae92-c5c4-4794-af6e-ba3e08c86be2/78645382078.pdf
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_f9702ce205af4ad3ad7c6ea12b6c6f3b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/11246000-1c43-45c3-8523-2b4bd34cd536/91989054454.pdf
    • https://uploads.strikinglycdn.com/files/e86df66a-f8d7-46fd-9658-aac4013147a8/how_to_give_a_good_buzz_cut.pdf
    • https://uploads.strikinglycdn.com/files/3b642e11-4c41-400f-9c5a-d324927b1b8f/96355576289.pdf
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_fde9d4e417b04dc9850962920b37ceba.pdf?index=true
    • https://9e084d23-5bbf-42ad-98e9-fa9200f8584e.filesusr.com/ugd/4f663b_9bf26102580149d6a36c67fb40ca513e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f4a5d91e-ef87-4012-8bca-df4316e5b373/49878392726.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_off0001126c.bin
198409da6191d43e749319678e42066aab3bbb83783600cb439402f20cb8473e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1126C 5292 bytes
font_01_sfnt_off0001247c.bin
b29dd3a587d2f8ce456e7310dced52d97ef3b863afd60de7485b6a95a92e93ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1247C 11388 bytes

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