Malicious PDF — malware analysis report

Static analysis result for SHA-256 3781899fc9b0714e…

MALICIOUS

PDF

67.8 KB Created: 2020-12-29 11:07:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 733c543d09625f5d2b9275f8ec1cc9f8 SHA-1: 71c1c0b6f8f54b654d411318732c0824b07af570 SHA-256: 3781899fc9b0714ee07afcf0b24477f3af822f319b425e18dccfc4c4ea0cd9e5
96 Risk Score

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 'traffset.ru', which is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the idea of a web-based lure.

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://traffset.ru/123?utm_term=midnight+plowboys+band PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383565/normal_5fe7514912829.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475997/normal_5fb2825472eec.pdfIn PDF document text
    • https://cdn.sqhk.co/zudipoje/hugdSrA/michael_todd_relationship_goals_podcast.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450145/normal_5fb94952d4a8b.pdfIn PDF document text
    • https://cdn.sqhk.co/lepezusija/7aiiSsx/slot_machine_meaning_in_spanish.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372972/normal_5f8aa890b2c6d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/jidugosizafuguxebite.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/whatsapp_handler_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/the_longevity_diet_valter_longo.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/endocrinology_guidelines_adrenal_insufficiency.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/trimble_r1_gnss_receiver_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/55736429362.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_off0000ca79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA79 5464 bytes
SHA-256: a5bb644104a0f11afbbf4f37b05ceebf1c4fc52ab045c822bb43eaf522a54506
font_01_sfnt_off0000dd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD26 10452 bytes
SHA-256: 40744075725262e2f9e20724eb793b8d16bf6a0e8c7f1d568ca928e295cd4489

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