Malicious PDF — malware analysis report

Static analysis result for SHA-256 7744f3848b242ba5…

MALICIOUS

PDF

77.7 KB Created: 2021-09-10 01:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dedad01e928fb6ccb5bafe17c369cdd5 SHA-1: 777849316a152b1ca322110b09c6c679fe090af4 SHA-256: 7744f3848b242ba5d6dd18db84b03cd093acfaa20a1d42569aa71055f316f46b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by ClamAV as Pdf.Phishing.Trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm structure, suggesting the PDF's purpose is to redirect users to external sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML classifier's output strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/46532673929.pdf In PDF document text
    • https://dodomacnosti.net/data/file/97590243855.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/15790797092.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/vevugenipezu.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/13538602834.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/pivunutoz.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/nifabiwaz.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/4106086632.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/xemesexer.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/1811624232.pdfIn PDF document text
    • https://andana.us/files/files/98959359118.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b99c6fb0---69474850882.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/tosuzoxanofelukisofobowug.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/94442837897.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7df1a21b6---2317103221.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/22361276965.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/jofosukosogivenutolifa.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/wajeb.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/21039350657.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/95000633567.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/vibazedabewogunefen.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/28370244239.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/fosaxolekuwemigepebixeno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=naruto+shippuden+75PDF 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_off0000c7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F9 10704 bytes
SHA-256: 3997fe37b6c3c38fb8fc5c365a17ad39e072bd1fb03ca751f53ef4cce457f107
font_01_sfnt_off0000e096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE096 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A8 18620 bytes
SHA-256: d988307ff4b45083c0762e0a47607a6ed4881166b430d105ef780c470ef520a6