Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad0eab54d593e20…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 08:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ebddc95b7ae3180077c14d38af154f6a SHA-1: f75303f0850c1eec6364c4475f5c41280c6a5e96 SHA-256: 3ad0eab54d593e202b5de733a4af3fda0cee65064ba0a2064630a54bfcbe0751
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to a link farm structure with numerous links to disposable domains, suggesting a phishing or malware distribution scheme. The embedded URLs reinforce this, directing users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403841a0b1e---sataroxi.pdf In PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/16550877627.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/zetuxodelit.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210903_022223.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/44655030706.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/72017003611.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/rolanabudemitebenupek.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/netozobasirovux.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/bogukovosivururiwija.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/povebom.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/fejiwevunanosufifitateb.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/mukatepesifekepuzifo.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/towopadokof.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/zadumivemaguligopareles.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/tafonirijajabesiv.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/aa2911e9206949df761bc0e63f3d051a/tadatopukagobeve.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/gedelegiwerafadunonapepar.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/roliparapomazujodegaxo.pdfIn PDF document text
    • http://salespate.com/userfiles/file/xosalo.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210903092423.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/57752215859.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/fudewokeg.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/govudimovavonisodiwujorel.pdfIn PDF document text
    • http://tonghuichem.com/upload/files/15848601642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=should+i+get+an+android+or+iphonePDF 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_off0000dbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E5 10680 bytes
SHA-256: 96cf59c2e44efa1a0847dd3ddb021b47b7d267e48363cd468e3e32e6a75623c6
font_02_sfnt_off00010c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C16 17656 bytes
SHA-256: c62dd7095a6790625c9e814a6fc08c8d2a834298acca36a6c76b344dd1d149d6