Malicious PDF — malware analysis report

Static analysis result for SHA-256 665bce5debb7ad1e…

MALICIOUS

PDF

72.0 KB Created: 2020-12-24 13:59:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d90a993f0ed010ef66149fa48c13cb2 SHA-1: dcdf75fd8e5ebe7c73397f60bc2735de40294301 SHA-256: 665bce5debb7ad1e773db9f601aa2bcaaa645a8c59ccebe6896dd12cfb98af8f
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'https://trafffi.ru/strik?utm_term=steam+link+raspberry+pi+4+retropie', which is likely used for phishing or to download a secondary payload. The document body, though heavily obfuscated, contains keywords suggesting a lure related to gaming hardware.

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=steam+link+raspberry+pi+4+retropie
    • https://cdn.sqhk.co/wememiguw/Wjcmrig/rodudazemi.pdf
    • https://cdn.sqhk.co/sufadoma/SGhgMjh/tuteruwobasakudobal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f04bd036-e68f-4333-9d8a-7ebb6806d5f6/the_de_broglie_relation_for_relativistic_particles_mastering_physics.pdf
    • https://uploads.strikinglycdn.com/files/abcede71-a338-4e7e-9963-9d031be33e3d/nawerexuliwupikexukuju.pdf
    • https://s3.amazonaws.com/pevuwarobuvowa/xuruvejetekig.pdf
    • https://s3.amazonaws.com/fadadedezeker/ganejun.pdf
    • https://s3.amazonaws.com/salosibejodod/punepixuxubeged.pdf
    • https://uploads.strikinglycdn.com/files/e7777499-e22a-49bb-b3d0-2e800395d60e/busavibesojoletajimek.pdf
    • https://uploads.strikinglycdn.com/files/1bce5522-c895-495b-91d4-fe0e7f4994d8/foruvimesulumodow.pdf
    • https://s3.amazonaws.com/pukaridimupo/odisha_govt_calendar_2015.pdf
    • https://s3.amazonaws.com/nowokil/jeberojenisidevexapaxib.pdf
    • https://uploads.strikinglycdn.com/files/799d8d5c-88ee-435e-b6de-72aa7ebbf930/50505871809.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_off0000db8d.bin
1920588bf521bd759544c85e5c582b0813f25a94c8ed4af4a95e208e7cc280fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8D 5464 bytes
font_01_sfnt_off0000ee13.bin
201152758673ad0294dd9f4a56b8784b175895d027e6d538f6f8aca759126218		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE13 10804 bytes

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