Malicious PDF — malware analysis report

Static analysis result for SHA-256 da33d059330eb057…

MALICIOUS

PDF

64.4 KB Created: 2020-11-16 14:40:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f27b740bcf6f0edc7f7514deba05f422 SHA-1: 18538044b0ed6bd60ee98cd9e35b268660b62f0c SHA-256: da33d059330eb05762ca5d88d3c04daf5abc93d8360c886e1d57a0281e31366e
96 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URI pointing to a suspicious domain, trafffi.ru. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, suggests a lure related to 'wrist joint anatomy pdf', likely to entice users to click the malicious link.

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://trafffi.ru/strik?utm_term=wrist+joint+anatomy+pdf PDF link annotation
    • https://bafovulik.weebly.com/uploads/1/3/1/0/131070506/rusew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410217/normal_5fa148752c5af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493920/normal_5faabf16776c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479678/normal_5fa63aaf71e21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366395/normal_5fa5a8a3649ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414174/normal_5f9fd2af78d4d.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/mamibis/boat_race_game_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/lightroom_apk_premium_3._6.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/fujilufot.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/differential_and_integral_calculus_by_feliciano_and_uy.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/kofimuxemuvarok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dc28bc8-1653-4abf-8caf-a8d6637af37e/sumewalebifakanibuxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d182692-bf46-48ce-bf1d-aab0d6dbcdd0/hobo_prison_brawl_7_unblocked.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_off0000c257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC257 5344 bytes
SHA-256: 02a1e8bcb5ec7e8c60705bd5ac130cccfc7d7dc7aa14534fd922c8aeafa0a299
font_01_sfnt_off0000d485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD485 9512 bytes
SHA-256: 288579b9cf3d790ccfc8219780b3faf16439e2df4b7552fceaec5d6bbb1b70f4