Malicious PDF — malware analysis report

Static analysis result for SHA-256 841280880730b7b7…

MALICIOUS

PDF

81.9 KB Created: 2021-04-16 10:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a66e5438acf605bc033060683dd24eb4 SHA-1: c9b2db9b7e412c0171b707926b95a86f82cdbcd5 SHA-256: 841280880730b7b75bc975c1d8b49f6a54a783e422ed75930c18bdf6f08ed0a5
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'druttle.ru' and another to 'waystep.site', suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document's structure is optimized for search engines to promote these links, likely as a phishing or malware distribution lure.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/strik?utm_term=quotes+from+call+of+the+wild+chapter+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481164/normal_60597cf601654.pdfIn PDF document text
    • http://waystep.site/cuanto_es_1_8_de_metro_en_centimetros5cjb3.pdfIn PDF document text
    • http://lnstagram-helping-centre.com/25733673901oubed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465387/normal_60473ec88c02e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499635/normal_5fd8b4b3c125f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484818/normal_5fcdb5582b8e0.pdfIn PDF document text
    • http://alex-chekalev.com/86788494646vwe9l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478716/normal_605efefe57509.pdfIn PDF document text
    • http://hookup753.fun/76558304410tlqu5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503524/normal_602e4ee3cafc4.pdfIn PDF document text
    • http://fejiximodanu.mygamesonline.org/cell_wall_synthesis_inhibitors.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456685/normal_606c8742493fb.pdfIn PDF document text
    • http://zuberisuxivaki.scienceontheweb.net/xelodegixeluferopojeda.pdfIn PDF document text
    • http://yesnutural.space/72528846326jph2z.pdfIn PDF document text
    • http://genusttwsr.fun/ziroradiweworekbw4in.pdfIn PDF document text
    • http://usesoda.pro/9716812822105v9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366989/normal_60148bdf97792.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/rubidokezive/rajuno.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/formation_barman_afpa_bordeaux.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/2020_design_download__crack.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_off0000fed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED4 5680 bytes
SHA-256: f620d93e6b562c9bee119b01ab635f648d6cd85cdad09777576523dcd5960f68
font_01_sfnt_off0001120c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120C 12652 bytes
SHA-256: a8298aeebdc03c680e4063d766fcf4812d42d941891a783935a5665ebf53d9f6

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