Malicious PDF — malware analysis report

Static analysis result for SHA-256 be709248bf044151…

MALICIOUS

PDF

69.9 KB Created: 2021-10-02 10:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6a55b765018638735e3b68f7c3d4d466 SHA-1: 07b88d42730fc4f103e039d63c7935423eaa87c8 SHA-256: be709248bf0441514ef3e1737329c75efea65b657da9a4b221068e427f29a27a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, distributing links across numerous disposable domains, likely to host malicious content or facilitate phishing. The presence of multiple unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613913477e405---joxapedigajizebanufono.pdf In PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e67f91c89---11157975399.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/69842950867.pdfIn PDF document text
    • http://goodmax.ru/i/files/98734229756.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/84273641726.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/pipepalobubemawekufuw.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/raziletugutakodasiziz.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/komajijekuwimevuwata.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/53398084686.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/misasone.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/kikuku.pdfIn PDF document text
    • http://etnorom.hu/pictures/81388255143.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/badumoreka.pdfIn PDF document text
    • https://rajakedua.com/contents/files/jupofenawasojo.pdfIn PDF document text
    • https://swiz.eu/files/editor/linevim.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/morajel.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/29997112800.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/guvuwizitukulutaba.pdfIn PDF document text
    • http://eventechsite.com/files/files/81572489726.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bavowemana.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/mikis.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/xujunabamajojabalefuliwer.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/zigapuzukiso.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/sulapijoxebebolesajarav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=gta+v+full+version+free+download+for+androidPDF 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_off0000aefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70E 16504 bytes
SHA-256: 71d84c4abf334d0195b9cc5884629ebc2579d21da21ebfbe1b14e1e4e8e7a29b
font_02_sfnt_off0000ef5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5A 10636 bytes
SHA-256: cf16211d6150e0c1bb3791b9790ebf0733adf1de7460138ee10628288148e54b