Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c3327ec889769a…

MALICIOUS

PDF

72.2 KB Created: 2020-12-21 18:15:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 83e6ff777fbbb5b98e4ac40743ddb1bf SHA-1: 18c36c1248417a8fda1d9232cf6313edfda910a0 SHA-256: 71c3327ec889769a581e0bba5317ed0343cc4ee56ff4912d61b08bd27f6312bc
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, many of which point to redirector infrastructure, specifically identified as 'traffmen.ru'. The document's content, though heavily obfuscated, suggests a lure related to email newsletter templates, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/aws?utm_term=email+newsletter+template+creator In PDF document text
    • https://cdn-cms.f-static.net/uploads/4459470/normal_5fd3770bdc110.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/6391395.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481409/normal_5fca2869ddb8c.pdfIn PDF document text
    • https://fiselowozol.weebly.com/uploads/1/3/4/3/134366189/wilafaba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366633/normal_5f93249f0f2ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478415/normal_5fd84f6c9b2c8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf104edabee7b440646b3/1606217988705/89049688888.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45670245-fb71-4b59-946d-f11ceee57046/91402621261.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5a039e9fc3622d54217d5/t/5fd232791693665fc7dc20c7/1607611003413/3496063654.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc70b075c272238a817d8b0/t/5fcf12377cc0b10a0ac940ae/1607406136946/kipudekadinijumex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/730df86e-8f3a-4f59-8bd3-d9a4eb440abe/monster_hunter_world_research_commission_ticket_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59c0a31b-c4b4-4b77-83f3-611a549581a8/logup.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdff8c85b7bc96605613c04/t/5fdffe12e64f57031550025f/1608515091078/caymus_2016_cabernet_tech_sheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcec1208e06c339b868b71c/t/5fd0735775f5e504857238f6/1607496536029/best_tabletop_games_steam.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_off0000de17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE17 5128 bytes
SHA-256: 568b52cd3d98d8c60c22dbc942af49e60e7e94e185a69e60611ac3e78a759332
font_01_sfnt_off0000ef84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF84 10652 bytes
SHA-256: 04e46f96b306c0d46d99b459114721619278df0eec5d208f6956347b731882f3

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