Malicious PDF — malware analysis report

Static analysis result for SHA-256 9baf39fd479a7647…

MALICIOUS

PDF

80.0 KB Created: 2021-09-10 22:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 95151d5eaa88d17cb7060d936c6b83f6 SHA-1: b39620fc4f602c90e870da5792ef6c2f047d61c2 SHA-256: 9baf39fd479a76474ca1a1d69dfe88f9e5eb50cc07c972e48aa2cee6e1cceaa7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The PDF contains numerous embedded links, many of which point to disposable hosting or redirectors, indicating a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, aligning with phishing and malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=quel+est+le+meilleur+navigateur+android PDF link annotation
    • http://bekescsaba.varosom.hu/userfiles/files/nanakegapijuz.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///94421311112.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/nodawovuneserarer.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/ramefabo.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/xedotif.pdfIn PDF document text
    • https://rm-parketi.si/uploads/50901475006.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/ginaru.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/pm040atic8hs9feroq3gclbb57/foruwuvapopimotej.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/lazamijomuwilodi.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/8858471468.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/dezejigiwefa.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/mivomegajemikogitizi.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613451e55a4ea---69906742687.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210907170254_3wdj20.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/mobumudaxuwufamot.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/6526910302.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/kibodavolijuxukar.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/23025480630.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/5976386737.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/20445375012.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/60375051098.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/1362151081.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/32344427122.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/ronorixiwedu.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://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_off0000d225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD225 18548 bytes
SHA-256: 80043dd1d8f4fd0ea9c85f8a6ed3b1bc9c2feeb275b18b1e4390d283fbb7d586
font_01_sfnt_off00010132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10132 10816 bytes
SHA-256: e0e793a1f5fcfa843642fec8e07b31f172ce9a72f2b6de3e17450b00506e8f04
font_02_sfnt_off00011a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1