Malicious PDF — malware analysis report

Static analysis result for SHA-256 0063702dcb74cf9e…

MALICIOUS

PDF

72.1 KB Created: 2021-05-04 04:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 6f4a7b106b757a2952268d1f5007a1f9 SHA-1: 56a79f067cdc0aab2d54bc1739d28cd4a3f9775e SHA-256: 0063702dcb74cf9e2a942cac326fec1ed1676390bacc4866ad0e0828b000c9dc
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with the primary one being https://vilenefex.ru/strik. The ML classifier and ClamAV detection strongly indicate maliciousness, likely phishing or trojan activity. The document body, though heavily obfuscated, appears to be a lure related to an academic PDF, aiming to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • 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=governing+california+in+the+twenty+first+century+5th+edition+pdf PDF link annotation
    • http://buybritishcat.com/how_to_use_parallette_barse8j01.pdfIn PDF document text
    • http://idem-peshkom.ru/core_java_interview_questions_and_answers_for_5_years_experienceuksy9.pdfIn PDF document text
    • http://verification-help.business/how_do_i_put_my_call_on_speakery8a4b.pdfIn PDF document text
    • http://uber-global.com/63780514843lqt3w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425224/normal_60293ed25dab7.pdfIn PDF document text
    • http://dibiwunineso.iblogger.org/77240069298.pdfIn PDF document text
    • http://kipigonatusa.iblogger.org/bematech_4200_th_manual.pdfIn PDF document text
    • http://naturwows.space/why_wont_my_hp_envy_5530_printael0t.pdfIn PDF document text
    • http://gordei2d.com/cryptocurrency_for_dummiesdqhsy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369522/normal_5fe70b42aad2a.pdfIn PDF document text
    • http://firstsecu-paypal.com/33999938380g2ci4.pdfIn PDF document text
    • http://believes.space/briefing_document_template_ukyfis1.pdfIn PDF document text
    • http://passive-income.ru/forivunugipiliu5r4o.pdfIn PDF document text
    • http://game-pro.xyz/828506448109qk7v.pdfIn PDF document text
    • http://safetymirrors.xyz/how_much_is_pentair_worthwbv1y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452152/normal_6046d3baa843a.pdfIn PDF document text
    • http://tex-comm.ru/91887468382wvj0e.pdfIn PDF document text
    • http://tosiwegijulu.iblogger.org/detailed_lesson_plan_in_filipino_grade_2_pandiwa.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/bisegilupuf/nobosetumexeb.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/election_of_1824_and_1828_worksheet.pdfIn PDF document text
    • http://wepatimaleb.epizy.com/29489948617.pdfIn PDF document text
    • http://mimewimirul.rf.gd/microsoft_windows_server_2012_r2_standard_64-bit_iso.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/vebinux.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/norcold_fridge_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/87492845348.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_off0000db09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB09 5828 bytes
SHA-256: 1dcfed97eca3fec3600002c43d02a3d59bdd547e6d8bb385bda437ec95f4031a
font_01_sfnt_off0000ef01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF01 10200 bytes
SHA-256: ef67348655bbff4a794334a14336fe697b4a70bd4342c3d3a7d8e8c5852d6882

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