Malicious PDF — malware analysis report

Static analysis result for SHA-256 8204526f25280849…

MALICIOUS

PDF

74.6 KB Created: 2021-09-12 14:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48c39466b812119ce4a87ff7b3e8e505 SHA-1: d7613b3975111179582c5445fccfb22b1e9240e9 SHA-256: 8204526f252808495555228024dca39798dd6466e45f133d442b441929aa9c2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to host malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ML classifier strongly indicate malicious intent. The presence of a URL related to 'shockwave player android' suggests a lure to trick users into downloading potentially harmful software or visiting a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://heuresromantiques.com/upload/files/vazenopisosazirazirafud.pdf
    • http://smartraoptics.com/fck_filemanager_upload/file/98282615557.pdf
    • https://pmcp-avac.com/files/upload-ckfinder/files/rivulopawajufomo.pdf
    • http://ahrestygz.com/userfiles/files/20210909_042606.pdf
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/firezisopuw.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-9-1/20210901102705469031.pdf
    • http://lahma.pl/_u/userfiles/file/jetajisugapiduwudavus.pdf
    • https://madeirashopping.com/userfiles/file/vabanel.pdf
    • http://4bx.pl/public/file/76606356423.pdf
    • http://rongqichem.com/upload/files/bobaxidon.pdf
    • http://alt-1c.ru/userfiles/file/5286105532.pdf
    • https://sdhouse.info/ckfinder/userfiles/files/50642885581.pdf
    • https://johanbjerke.se/userfiles/file/3059209899.pdf
    • http://holzweiss.at/95935153456.pdf
    • https://thebottombillion.org/business_school/uploads/file/laxedepofufekatekoker.pdf
    • https://venus-forever.com/image/files/pafego.pdf
    • http://tavaszitura.eu/userfiles/files/111113638.pdf
    • https://melz-feu.ru/upload/rebiwefekezunovuwameviwik.pdf
    • http://acelybio.com/upload/files/xikebefapojalifemavivose.pdf
    • http://21cedu.com/pds/userfiles/files/27490227332.pdf
    • https://okazionche.com/files/54995670402.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/hdbmq3kn0cc6ek7sqp7b6lgnu6/8267599249.pdf
    • http://tion.hu/upload/file/kilatuxejekudoxowagan.pdf
    • https://nordiskvillaventilation.dk/userfiles/file/nurevopemevubumi.pdf
    • https://rux-thai.com/ckfinder/userfiles/files/muredurajovubixoxax.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=shockwave+player+android
    • 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_off0000bf43.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF43 16792 bytes
font_01_sfnt_off0000d755.bin
6f4467c09b18762a6b077f8b98621910a866a751463161deba461946af6c8538		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD755 17556 bytes
font_02_sfnt_off000103d1.bin
23607cde807fec8a44725c269b80f4a1634289fde50bccf46358b28c99e995e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103D1 10780 bytes

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