Malicious PDF — malware analysis report

Static analysis result for SHA-256 966ce79f43b30db9…

MALICIOUS

PDF

69.7 KB Created: 2021-10-04 10:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3681d2efa051b84495f977422cbef619 SHA-1: 52443fb166f052fcd9a6a15c253de4aed4ac7acf SHA-256: 966ce79f43b30db9006e6ffbcaf6f622f7427a4616740a7f1ce709cd73e09c2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • 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://synerhu.ru/uplcv?utm_term=use+a+question+tag PDF link annotation
    • http://wsmr.us/userfiles/file/22868057845.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/gujovemunimezarudud.pdfIn PDF document text
    • https://trainova.com/userfiles/file/81127167207.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/lukexuwirub.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/98567663946.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/xemeroxerijemosowavanemas.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/xiweg.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/4788802312.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/61632674923.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/0f6b4355cf53f93cf2d15e9cac6b40a2/timufebale.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/zirisibifes.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/75653889313.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210911_115CD5A2E0BDA8D9.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/lobef.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/vijaretim.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/96314634417.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3728791630.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/61238571302.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/vijotinumorabixatapidifu.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/kifubixuduxubawumiditunu.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/62716409291.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guxamakinisun.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/95829123568.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/pujebu.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/subobaxoredorofebab.pdfIn PDF document text
    • http://armanetti.com/images/92783939207.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_off0000b22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22B 15796 bytes
SHA-256: 7f2a25fc7627ba0a530092a4415884edfdead512c32cfde570fd54588a64a717
font_01_sfnt_off0000da39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA39 10388 bytes
SHA-256: 25c6bcdb617a7a4dc495d7aad3368b233cd85a9fdfd3ed22b9b4760a635912a3
font_02_sfnt_off0000f199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1