Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb64fe940a69fc21…

MALICIOUS

PDF

68.9 KB Created: 2020-11-24 19:04:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 342c349e01ace9dc793bb5cf976cfaec SHA-1: e8d327d4beffdbb1eb5887b5abcf1036f0395b82 SHA-256: cb64fe940a69fc21a751c2b8aa90d6e16c0969335f0bc050e415a865462cd0bc
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, with a high risk score. It contains an embedded URL pointing to 'trafftec.ru/strik', which is likely used to deliver a secondary payload or conduct phishing. The document body, though heavily obfuscated, suggests a lure related to jokes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/strik?utm_term=funny+comedian+quotes+jokes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476302/normal_5fb48d4e222da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372376/normal_5f931b65c2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458631/normal_5fb75ea8625b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482407/normal_5fb733d790193.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392868/normal_5fa3f031c8f8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370778/normal_5fa8e2a17d3b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375206/normal_5f9b4600e2cf7.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/c084eaaf-6e71-4783-8e2a-5103c759429b/ladax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2aa1405-b72f-4676-879d-e7a652b4477c/duxelojexupuditizerowaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b51d763a-44f5-4d77-8b1d-75709d39e8da/t_harv_eker_millionaire_mind.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e88336ed-f7e6-4ea6-a24f-f4c3d30ee6b6/kalega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fdff8ef-0fd3-4774-b692-ffd4ae09536b/tween_girl_book_bags.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c698f9c-4433-44bf-8528-b5a3ea8fd63b/who_built_america_volume_2.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_off0000cebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBD 5280 bytes
SHA-256: 71f5455f50fddfd2cf277e7ce12a6d0bd7cb3355811a6f8f71687e1265983a15
font_01_sfnt_off0000e0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AF 11488 bytes
SHA-256: cad1a067799bfdaf4fa478fb0374bb5e62e03e77c824e00c3be63b71190d4072

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