Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8939d41c273840…

MALICIOUS

PDF

68.5 KB Created: 2021-09-26 21:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c6cdbab245fbcde4e6ef3efcfb3452f3 SHA-1: 418aab5b5e8dc10a46a48b175497ec6dc248d567 SHA-256: 7d8939d41c27384015527e914787c5e0985f4b94bd3af86cdaca062c6f98a79f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URLs, many of which are associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware by redirecting users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=achievers+7+band+book+pdf+free+download
    • https://livewireeventz.com/userfiles/file/57132535553.pdf
    • http://vividconcept.in/userfiles/file/dufujowijodiwilexeno.pdf
    • http://mousike.it/img_ins/files/pezibenajasirajefazitumov.pdf
    • http://kodemari.info/data/files/99759242035.pdf
    • http://leprofit.ee/cmsfile/contentfiles/29626455356.pdf
    • https://sanvexe.vn/webroot/img/files/23864587226.pdf
    • http://metaglas.kr/userData/board/file/memigomilezujusawevuji.pdf
    • http://ecoaga.com/documentos/file/nemixepekifimi.pdf
    • http://kozhencherrymtc.org/userfiles/file/99591164186.pdf
    • https://limadelimon.com/images/file/jogaraf.pdf
    • https://inprovitargentina.com/ckfinder/userfiles/files/jisogalamel.pdf
    • https://basalyemek.com/ckfinder/userfiles/files/64435097722.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b4c8b84453---jugifirivovegesukanutorox.pdf
    • https://laetitiabernard.fr/images/file/50754430956.pdf
    • http://metamorfoza-krosno.pl/userfiles/file/87039663252.pdf
    • http://5percent-design-action.com/upload/users/files/36725926454.pdf
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/55349593474.pdf
    • http://labonscafe.com/userfiles/fowufotasotipowef.pdf
    • https://mgc.to/sites/web/upload/files/zonujebopame.pdf
    • http://nelly-design.ru/upload/files/luwidi.pdf
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/tubazezujora.pdf
    • http://woodlandhills.ilovepokebar.com/uploads/files/56703258925.pdf
    • http://sumosushingrill.com/uploads/files/62647674356.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000acde.bin
afabb74c5fd87ed8501533f7aaecdeae114ee526b8d9896038e86fedf294cc94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACDE 11032 bytes
font_01_sfnt_off0000c667.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC667 16792 bytes
font_02_sfnt_off0000de79.bin
3e73f51dd8f9d41bca61b17b72473da57ba2771593f48dd55aefdbbc37c7a9db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE79 14844 bytes

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