Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6ef3310f06ec9c…

MALICIOUS

PDF

77.7 KB Created: 2021-10-25 16:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 70881077f29238e5d0435bee5f44b4b6 SHA-1: 3ec14b5b734130dd87b127e9eab36eed824acb7c SHA-256: 6b6ef3310f06ec9c4e0c3a317b4992e51a62cd2a4042dd004499c0d2c380e43a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to external sites, many of which are hosted on potentially disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to distribute links across many low-reputation hosts. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://seto.cz/uploads/31436088648.pdf In PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fipivobanubuviweloseja.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/57686993490.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/48807192773.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/75489346199.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/3dd363d61b7590689249d6df1106cfd5/62569864265.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/41838495515.pdfIn PDF document text
    • http://dpkwi.org/userfiles/files/xiluvireli.pdfIn PDF document text
    • https://manisafar.com/basefile/marcosafarir/files/41724769097.pdfIn PDF document text
    • https://sanidom.pl/img/file/letuxokem.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/15791966858.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/995a26d8b231c6124c03f08415ac7015/8911327310.pdfIn PDF document text
    • https://creativekids.abcedukacji.pl/web/uploads/files/vaxetebivodix.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/48913053007.pdfIn PDF document text
    • https://uudanbury.life/files/file/12639820466.pdfIn PDF document text
    • http://perksys.com/userfiles/file/josazalasevugud.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/88058360004.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/3345727059.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/33768341033.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/95108553899.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/dapokufu.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/vewemetifewup.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/gosovedubuweg.pdfIn PDF document text
    • https://matkinhantai.com/luutru/files/buwezivobipadamaz.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/cmwvf4RlXg4/uplcv?utm_term=family+law+lawyersPDF link annotation
    • 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://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_off0000d17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17F 15976 bytes
SHA-256: 6d192f1e3445cd927e1d1f8480d97bce1810fdb01c4ad17cea9caef4d6844bf0
font_01_sfnt_off0000fa77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA77 10124 bytes
SHA-256: 40defd0ed2cb0b4c5083fd032b984eefa3eb32942c2de9ae068bd44116a6aaad
font_02_sfnt_off00011113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11113 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1