Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8e21382e42c072…

MALICIOUS

PDF

81.3 KB Created: 2021-09-15 18:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d875bb78f625ab5df3bfdbcc5d15756 SHA-1: cbdae85ff5d215552503fd434000073198a0b982 SHA-256: 5d8e21382e42c0724b3066878c2abaeca6e37f41db3bf88bb0ac2d9b5a69f023
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://avtokit116.ru/!upload/files/kolodugojinegunivam.pdf
    • http://www.naraihillgolf.com/admin/userfiles/file/kefupinukonolupes.pdf
    • http://www.facyt.com.ar/ckfinder/userfiles/files/33370748371.pdf
    • http://yogo110.com/userfiles/file/kutisuxefatemesofovuz.pdf
    • http://primaria-ciocirlia.ro/media/file/kiredimataxaxenirivazira.pdf
    • https://bilegt.mn/userfiles/files/guvazijifajususonegiba.pdf
    • https://seikai.jp/free_images/files/fexojanewadexowotizaz.pdf
    • http://indyztyle.com/ckfinder/userfiles/files/94568551821.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391e3ec4709---ximoleridemazilajoto.pdf
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/91052626080.pdf
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/91457691206.pdf
    • http://cosyromania.com/media/file/navofotafevanomev.pdf
    • https://sysyanginguvenlik.com/uploads/files/wowavexigewubafakimon.pdf
    • http://refpecsbelvaros.hu/kepek/files/64506040208.pdf
    • http://matstravel.ru/userfiles/file/bobinuzivadafi.pdf
    • http://daiwavn.com/uploads/image/files/kivonojibofegunisu.pdf
    • http://casier-a-bouteilles.fr/file/sikexedilavememebe.pdf
    • http://eyupsifalibitkiler.com/resimler/files/tulut.pdf
    • http://jedwines.com/cmsCart/upload/file/nobanapi.pdf
    • https://isleo.com/i_photos/file/89729316321.pdf
    • https://cherrychile.cl/cherry/uploads/contenido/files/tejevifumifelu.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132be195e5f4---nefuzikenuwi.pdf
    • http://julianina.dk/upload/file/9818296846.pdf
    • https://makenie.com/upload/files/zijej.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=watch+no+time+to+die+free
    • 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_off0000da19.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA19 16792 bytes
font_01_sfnt_off0000f230.bin
2ae76b29ce4b57ad90404b9a8274e3e819e44493f07abffac9b9da40c78f520a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF230 10520 bytes
font_02_sfnt_off000109f6.bin
48d5d6f5e5604785ff0f2f2d13fddbb222161e18408a8c3aa7fb6823815dcea2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109F6 17716 bytes

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