Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd8cfd48c496fba…

MALICIOUS

PDF

73.5 KB Created: 2021-09-28 17:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3a0d67ac521b41df481dc2b70fa35a4c SHA-1: 294fd8b8366939216336426b959b82afcc7e0b36 SHA-256: 7dd8cfd48c496fbab91b3bacbe117b656840f5355075fe68ed5c04469da54503
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to lead users to potentially harmful sites.

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://jasmijnbloemengroen.nl/userfiles/file/57758687333.pdf In PDF document text
    • http://anninh247.info/upload/files/nojulovemuguseni.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/16035814370.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/39083493829.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/jurumatep.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/najaselifur.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/49477539759.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///81635809540.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/67951662909.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/mufufonepiwefi.pdfIn PDF document text
    • https://wmu24.ru/media/file/godumolidiseposujufiwisin.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/rufixetasekaf.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/mevatodabizajilipotatin.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6008671627.pdfIn PDF document text
    • https://sharenkon.com/files/wanuba.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/70469957680.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/lijeda.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/lozixun.pdfIn PDF document text
    • https://penzion-palice.cz/content/tuzezizenaxovigatun.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fca2bf469---nagametamutidipevur.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/lufijarewixilejumati.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9eec18684---77974831039.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/muxupowabefugakifuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=spark+im+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_off0000b7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DD 10380 bytes
SHA-256: de6ed86b39244a4340ba9ae4693d166897ba28798fb4a512fe16d67feb9cce56
font_01_sfnt_off0000cf47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE759 18576 bytes
SHA-256: b269a7e50c0626b63a8143b0b2576c930470600c1e4e2337cef29143b85b454a