Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ac4c0ae6165663…

MALICIOUS

PDF

86.1 KB Created: 2021-09-16 08:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 25a882b7df0ca031c2a3115f525e2732 SHA-1: a1b73131d8dd52e5bb715f14d807f8eb4fcee82c SHA-256: c3ac4c0ae61656639732f0f4913ffb86498e9dfdf71f460d968dabd0a3f5417e
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=gta+san+andreas+free+download+cleo+mods PDF link annotation
    • https://szabobuszberles.hu/files/files/wimofovukomebudepudo.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/nukikavuwivubamolikaw.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/87876945323.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/2687333270.pdfIn PDF document text
    • http://bdn10.cz/files/file/78990786429.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kiverujeli.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/giwejubakibozumolev.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/jijumexagete.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/lotapotax.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/65114629123.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1376c3861---buzoxepokimo.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/bimosek.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/tomotilemedemavamalor.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/xekafenivowudanoga.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/851830681613b880abc4a6.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/23234998304.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/supixazuzoxulopuzemosogeb.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/75184052307.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/45533263212.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/53332410725.pdfIn PDF document text
    • http://sksound.com/userfiles/file/59654407781.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/20416469490.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/rnku90gsg7fsu9u0ntijjd7tr7/27683721323.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/gokelulakulisesixu.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_off0000ee09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE09 16996 bytes
SHA-256: 19099fa6f32b42f8a4aa5aff5e6e3e0102587a510c727d9225b9e2b8b5b9223f
font_01_sfnt_off000119eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EB 10672 bytes
SHA-256: 7ea4a04cd7f1bc2d9d983c59e8710c604ec3dd99375624fb138c06d906943a4a
font_02_sfnt_off00013281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13281 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1