Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b5d31fd1251c938…

MALICIOUS

PDF

74.4 KB Created: 2021-09-11 12:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e13e461c66b79690bf8403e0daf724ac SHA-1: 598394a0125e2b516d19d76e54cc322a7f5d59ac SHA-256: 2b5d31fd1251c9389a6f86c333cd40e1d482c3b823751daac0375775cd57c668
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is part of a link farm, likely designed to obscure the true destination and potentially host multiple malicious payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://gpkoaee.ru/ckfinder/userfiles/files/sijuvosikojevogipuvagi.pdf
    • https://asesoriagade.com/app/webroot/files/files/52812762557.pdf
    • https://hongming-eco.com/userfiles/file/vavunenazis.pdf
    • https://hankilfood.com/upfile/files/25508192677.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/856ce3e39984900b39f5e95916bec6cd/mifesofolamegenaxevepemob.pdf
    • http://delannahotel.com/user_img/file/pivogalakalodawewexaw.pdf
    • https://mingyi-lock.com/data/file/userfiles/files/91800925422.pdf
    • https://aprilboya.com/userfiles/file/pitaronafewaruta.pdf
    • https://mmoxx.mn/userfiles/files/10079887146.pdf
    • http://tobn56.com/UpFiles/file/4421462121.pdf
    • http://jagdrevier.hu/upload/images/file/43531698561.pdf
    • http://ifap.it/images/file/luvivegobumufikakisesike.pdf
    • http://pedraferro.com/files/files/1413838058.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f01dd6acab---sagifi.pdf
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/xemutolajatu.pdf
    • https://didacostruzioni.it/userfiles/file/finowusenokeladifoduvoj.pdf
    • http://regimhotelierbucuresti.com/images/userfiles/85797499563.pdf
    • http://chatyzvule.cz/uploads/39934182787.pdf
    • http://eakqshop.com/ckfinder/images_store/files/lofokizirire.pdf
    • https://anup.bo/images/files/gowupuveduzivunelota.pdf
    • http://baohanhranghm.com/upload/img/files/gerufarawimawozunoxor.pdf
    • http://cardealer-space.com/js/upload/files/worodiwolozupisupenuxevep.pdf
    • https://shopinhome.com/ci/userfiles/files/tififugi.pdf
    • http://svazekobciorlice.cz/userfiles/file/lunomojetulatenulupo.pdf
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/18750672522.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=temple+run+2+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_off0000be87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE87 16792 bytes
font_01_sfnt_off0000d699.bin
2ee420b7992855ce6343e19318fea1b8e1595ca58c51a4050fe9d3e27144cdef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD699 17768 bytes
font_02_sfnt_off00010489.bin
71b00c0de5d2012eca3dc4623a1f8101f9567706affd6e568c213b20dd946548		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10489 10468 bytes

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