Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dea937d2b6832be…

MALICIOUS

PDF

69.3 KB Created: 2020-12-18 03:50:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 85e73cd64ca0f4e2edeb877b771e5c5b SHA-1: 8bdf20d07470766cc1546171171ed1c5bb37d6e9 SHA-256: 1dea937d2b6832be138bd4f94343b3574193710ca519e5f4130f21ad2e3c6aeb
156 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 multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The presence of a PDF link farm heuristic and an embedded URI pointing to 'traffine.ru' suggests a phishing or content distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffine.ru/strik?utm_term=real+artists+don%2527t+starve+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401691/normal_5f9b27bd2f446.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386087/normal_5f924d3d59251.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377938/normal_5fc55ec066f10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500430/normal_5fb2bb34306eb.pdfIn PDF document text
    • https://gigufeti.weebly.com/uploads/1/3/4/6/134633464/bd2db4.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/tadevewuju/sanuvotajexivupu.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/fowesudujotub.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce600256a976706ec7bb52/t/5fd0ee4d326be838644c2041/1607528014461/humans_vs_zombies_rit.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/suffixes_worksheets_grade_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff930657-8084-4302-925c-93b0d19cd1ea/kulesewivajute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0ddcadd-75d3-473b-bcb4-f536591bfe78/makokirewuvobilog.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/fanut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55597bb7-adb8-4141-94e5-c01975390882/viva_la_vida_mp3.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc66f087848ba205d3ecad5/t/5fc783baad3e64119248cbb3/1606910907325/1943526080.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_off0000cd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD78 5228 bytes
SHA-256: 63dc428ff2238ec5b88a03fb1ca644705bd9f4d1ea7ddde1cefba5a01f676ff3
font_01_sfnt_off0000df71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF71 12108 bytes
SHA-256: 8957e44766c39d4aaa701035e9a04aa6b628cbc72b5d210a8ded2f1edbc883ef

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