Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc75dd6cc0efcaa…

MALICIOUS

PDF

88.8 KB Created: 2021-09-20 17:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2fb6b14925c454d48409b8f936c2ea8f SHA-1: 2d38a1be270474cce0f0eab51673924fcc71ef7b SHA-256: 1bc75dd6cc0efcaa0a813a0695d87c286d77a29ab42d52df678ae5f29f64d3ae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one heuristic specifically identifying it as a link farm on disposable hosting. ClamAV detected it as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The presence of external URIs suggests an attempt to redirect the user to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://chcial.ru/uplcv?utm_term=broly+movie+2019+full+movie+english PDF link annotation
    • http://synergyproperty.com/images/files/73366710314.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/puzakezalasox.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/fowaga.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/95588152482.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/2f879c37f9d979f0c76c477727917325/watene.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/bozaxijaruginererewipa.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210905_93EB0ED5378E9AA2.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/gosexovowikoz.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/79485716977.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/11937463635.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/83696115523.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/likamisobelevutotexufaba.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/65996398944.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/85912694469.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/68425718808.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/50146337222.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/zowebevinadig.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/pipobalavawowunipudimat.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1614257ed2e111---venaler.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/20536191439.pdfIn PDF document text
    • http://ndt-ultratech.com/files/69200858729.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/tozegekane.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/91964798098.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_off0000ef44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF44 11196 bytes
SHA-256: ca5635f9e330ee94a1abbd2747767d64fdadf1a150733f061c46abc11d012f5d
font_01_sfnt_off00010968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10968 19868 bytes
SHA-256: 37bed5811382b77cd1d4865536c7bcbc573a8e6cb00b1a94ce9bd665e0c1a5c7
font_02_sfnt_off00013d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1