Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8881e8c593bbd7…

MALICIOUS

PDF

58.4 KB Created: 2020-11-22 00:45:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 7c3066aabaae27a214e81b20bdc66f8b SHA-1: 131bc0d06042a0b122a6c0d7c9f395b847c882f1 SHA-256: ec8881e8c593bbd7735b5552e31ca51bacafcc68b494efd014c8e3def995c5aa
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URL pointing to 'trafffi.ru', which is suspicious. The document body, though heavily obfuscated, suggests a 'worksheet' lure, aligning with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffi.ru/aws?utm_term=worksheet+list+of+irregular+verbs PDF link annotation
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/vozetovuxukelul.pdfIn PDF document text
    • https://dipitamadupod.weebly.com/uploads/1/3/4/8/134882687/f92a80198a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_5fb795eb1188f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/02f6134b-bd42-4314-bc6f-511468e8a355/scott_and_jo_girlfriends_guide_to_divorce.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28b9e154-95c7-4692-9b5e-cc33c7aa33b8/57390091493.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/30131777981.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20a6a2be-8689-406e-8596-b8b713db8904/41353389575.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/20674343420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c611e02e-5742-4961-b637-7bb119a7535c/magistrate_definition_ancient_rome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d60b7dc3-0327-40a1-ab2f-a67a261382f5/manual_videojet_2350.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/examples_of_an_annotated_bibliography_ama.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/bjrn_hcke_buch.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_off0000a903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA903 5308 bytes
SHA-256: 9651bed8115fbc52d4b1ec746c7a246729cd4409e0addaca90e3b212b25458c7
font_01_sfnt_off0000bb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB27 10004 bytes
SHA-256: 09c7c2634fa890b4b44019f873b253928cb2860fb99096af8ec336e5418006e3