Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea54029d40383d8…

MALICIOUS

PDF

60.2 KB Created: 2020-12-21 03:56:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: cf669f2d12374e96e18d0706840dcfde SHA-1: e0a8860f5856e650cfa41fde451ecce6b2d55d67 SHA-256: 8ea54029d40383d8bf01fa0e62d3b71b13ecbad04d440766d7879c794eca843a
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, specifically as a phishing trojan. It contains an embedded URL pointing to 'trafffe.ru/strik', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to a 'Duck hunter camo shirt'. No scripts were extracted, but the presence of an external URI and the ML/AV detections strongly indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://trafffe.ru/strik?utm_term=duck+hunter+camo+shirt PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471455/normal_5fca8f0fb8f17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393488/normal_5fa05c3c72308.pdfIn PDF document text
    • https://porovepo.weebly.com/uploads/1/3/4/5/134527374/770282.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448115/normal_5faa052f20a44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369332/normal_5fd3b673ccab2.pdfIn PDF document text
    • https://getukesi.weebly.com/uploads/1/3/4/7/134735407/f025c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386618/normal_5fcbf983475e1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc580655e8e827d42ad0269/t/5fce9f48c9e0980240234c44/1607376714685/how_did_the_duck_hunt_gun_work.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdcba3c92f0e27cb84b8f30/t/5fdcf9af43516c351de32e0b/1608317362491/black_hole_sun_ukulele.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc00635ff13940aa23ad6dd/t/5fc16b3cbc819f1cf40dc830/1606511421454/dire_straits_romeo_and_juliet_tab.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA566 4952 bytes
SHA-256: e4d63774a90c5033d9e44320a3d305a667440188d13a6ea250c0816c49391083
font_01_sfnt_off0000b608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB608 9476 bytes
SHA-256: 0e85303219353e96f169d56b213dd9ca1fd119d061b10a43205919855e6358a1
font_02_sfnt_off0000d667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD667 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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