Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fda7d4bc2f3c038…

MALICIOUS

PDF

78.9 KB Created: 2021-01-13 16:59:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: bceeccb868e8ced5cda780241f782a26 SHA-1: ad279f6634414a074d2182ac8b19c0e03122a932 SHA-256: 5fda7d4bc2f3c03841fffac75ad2a4fd1594b87c15be9182fd09b8079c579534
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating a browser extension installation lure. The embedded URL points to a suspicious domain, likely part of the attack chain. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to exploit vulnerabilities or trick the user into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://trafffi.ru/aws?utm_term=k7+antivirus+software+free++for+pc PDF link annotation
    • https://site-1178022.mozfiles.com/files/1178022/40k_mathhammer_spreadsheet.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/eibaghj/road_rage_gamecube.pdfIn PDF document text
    • https://site-1226241.mozfiles.com/files/1226241/mofetofoxifudowoxugiraju.pdfIn PDF document text
    • https://site-1177584.mozfiles.com/files/1177584/amc_theater_times_square.pdfIn PDF document text
    • https://site-1174026.mozfiles.com/files/1174026/pac_12_basketball_tournament_2019_tickets.pdfIn PDF document text
    • https://site-1176887.mozfiles.com/files/1176887/pafiv.pdfIn PDF document text
    • https://cdn.sqhk.co/vixokezafafu/RWImJYr/88456518106.pdfIn PDF document text
    • https://site-1173660.mozfiles.com/files/1173660/buvobedutuluxi.pdfIn PDF document text
    • https://cdn.sqhk.co/genamudazunu/hhchj5n/hotlink_protection_definition.pdfIn PDF document text
    • https://site-1168007.mozfiles.com/files/1168007/iot_architecture_for_beginners.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/dujepav/lcm_gcf_worksheets_6th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/occupational_lung_diseases.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/hardwood_plywood_sheets_cut_to_size.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/10895329503.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_off0000fa2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2B 5176 bytes
SHA-256: a08ea51427052e3b47e3c45140261d08455f5b476e9fcea4e31a55cb63b064b5
font_01_sfnt_off00010bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFE 10100 bytes
SHA-256: 60d5be53bb55dff2d7db9b14f7964ee355f1698553bb741b6c2d8b3adfd41484

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