Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11109fd9039f092…

MALICIOUS

PDF

83.2 KB Created: 2021-09-15 12:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: f56b21941da285fec75f8f4bec53af0b SHA-1: a40aa07742823bf2a3ae09bcb0123273773fe82d SHA-256: c11109fd9039f092719542e30935f9e4073bea7e5f8dd745c7b9c5cd56c2e821
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The ClamAV detection and heuristic firings strongly indicate malicious intent, specifically related to phishing and potentially exploiting PDF vulnerabilities. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.2133

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://huntic.ru/uplcv?utm_term=efootball+pes+2020+mobile+apk PDF link annotation
    • https://ciela13.leaddeehub.com/userfiles/files/50412691010.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/regidubukutiji.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-07/images/files/pober.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/98029767822.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/54715146692.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/60688482484.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/7818177618.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/josexomi.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/6387896804.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/2916948960.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/favopejoti.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/ladomubepurajizilegugipe.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/14752334268.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c3229a96b---nokutajenadibedelov.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/59336347773.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/tupemitod.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/98769833083.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/64055301112.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/3927473142.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/jetumasusalun.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/berusujorexa.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/66294520021.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/34420919771.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/65767953138.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/mujsodlfmcrhevtjvsqmonvem0/55750172598.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C7 18416 bytes
SHA-256: 4d6b0a5f7c47d303f3c28d5c4923b007fb273949a0bdc7cd912f05f7ebb88e3c
font_01_sfnt_off000119f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F3 10772 bytes
SHA-256: 7fb06f3c73ca7ea1df92cf04578139a9220a6f3bfde58cf1cd1e10d40b597e68
font_02_sfnt_off00013299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13299 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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