Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92af3439746e264…

MALICIOUS

PDF

75.3 KB Created: 2021-03-03 18:52:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ca9af8a76ee1b705b79653ca856cb6b5 SHA-1: e8ddb8e5ca7e9b9d79c4357b76cdf2ba7e1c56f8 SHA-256: c92af3439746e2644cc886bbe0ba5e42846576b5df98c23cf84f800db8d89286
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains an embedded URI pointing to 'https://xajibur.ru/strik', which is likely used to redirect the user to a phishing or malware distribution site. The document body, though heavily corrupted, suggests a 'book review' lure, aligning with common social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=competition+demystified+book+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475728/normal_6014e40f6f4ef.pdfIn PDF document text
    • http://kijofizovurisos.medianewsonline.com/investment_banking_for_dummies_amazon.pdfIn PDF document text
    • http://serururepus.scienceontheweb.net/xerox_workcentre_7845_cost.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459029/normal_60096a57066b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368748/normal_6031348a85f08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452612/normal_6009f58d821cb.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/mitib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418781/normal_5ff22aea46c62.pdfIn PDF document text
    • http://miwewumexurigan.sportsontheweb.net/26472288679.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gazitif/adverse_action_letter.pdfIn PDF document text
    • http://benufalug.epizy.com/saburiwipazopumijidepo.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/canon_lbp_2900_driver_free.pdfIn PDF document text
    • http://zegisaxan.rf.gd/angolan_civil_war.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/dufufepomafoxonazusime.pdfIn PDF document text
    • http://ligoroxenafof.atwebpages.com/international_marketing_in_economics.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/gevoligesaveziwaz.pdfIn PDF document text
    • http://baletax.onlinewebshop.net/what_beans_has_the_lowest_carbs.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/40593608120.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_off0000eb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB31 5308 bytes
SHA-256: 36ee1164a7fc34de638de17acfdae25cd88008ff83634133f070e6d14c13eb63
font_01_sfnt_off0000fd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD45 10080 bytes
SHA-256: 12fa5572c4369c1f0dcae247e6ad131e85acb147a6023ccf49ad9acb48e6ab10

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