Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fdc9a9944235511…

MALICIOUS

PDF

82.0 KB Created: 2020-11-25 06:42:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: c6e660289042baa94e0467058b9db549 SHA-1: 7dfd3489f967253e611af93a98cda2db60ad0fb6 SHA-256: 5fdc9a9944235511062fe4fcd59bf19c2fcbf5f97d230a966d4530feec05bb98
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 'trafftec.ru', which is likely used for phishing or to download a secondary payload. The document body, though heavily obfuscated, suggests a lure related to '9 hole peg test norms male'. No scripts were extracted, but the PDF structure and embedded URL are strong indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=9+hole+peg+test+norms+male PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379841/normal_5f8be24476054.pdfIn PDF document text
    • https://lifafogiter.weebly.com/uploads/1/3/4/3/134321186/9944785.pdfIn PDF document text
    • https://towetebofipu.weebly.com/uploads/1/3/1/4/131437669/490299.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/04ad63c5-472c-4c46-bcd5-f2198ecc0134/kesuxozexadufibolixiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77d78330-4df3-4722-901a-dc8a34ccc42c/reflections_springfield_il.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/531710a7-e170-46a4-aa4d-cf2c5e4380f4/xezaxunugupikulatexejev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9dfae15-8557-4ceb-995e-10bf08f57603/how_to_view_private_instagram_accounts_real.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f84f6e1-38d9-414f-8584-43837318c18c/sasubiku.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/24859534740.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d7473e5-53bd-43cc-b33f-59615c3e428c/have_yourself_a_merry_little_christmas_piano_sheet_music_solo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4e34a9a-3401-442f-937f-5474193c6f97/pulposus_nucleus_medical_definition.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_off00010216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10216 5296 bytes
SHA-256: b2031b5f1dc77438411c8913cfef420c4e4415ec9b27bf5c88c8958b65a8ece3
font_01_sfnt_off000113e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E8 12340 bytes
SHA-256: f1bc7a704e8d543f29b0e6bbea2d60f065d9d563898578c5496baba515c40165