Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec7169dc2cf3bfb…

MALICIOUS

PDF

72.4 KB Created: 2021-09-15 13:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f81eb296107b38f565504ea05e05bafa SHA-1: c9e5f4fb2677a555ed51144ef448de4ed47e579e SHA-256: cec7169dc2cf3bfb7aab549b2aec53b60f79eb792b3fd07070cd947f7e52c91f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://france-ex.com/images/blog/file/lukuxaxuwarubudekigokonu.pdf In PDF document text
    • http://lukinserv.hu/file/gadaloz.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210911_B3310FF3B970A270.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/34269705628.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/kexudusebudizapowotukosej.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/fesulebewarozujiso.pdfIn PDF document text
    • http://beiks.info/public/file/73554092655.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/kusif.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210902210401.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/11047890426.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/88068080349.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/jipaxubemoxowopawuse.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/nafomikeriwumuguvotuzu.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/36608542623.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/bajawazinologuluraw.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/85333127469.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/48276412054.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/1077124896.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109130912218135.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613789883f1f5---50589074823.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/vatifibara.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/66261870426.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210901100552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cyberlink+powerdirector+apkPDF 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_off0000b9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A0 10804 bytes
SHA-256: d8d1e6daf3333311cbd2ac41b943c78abdf13b3fd1ac5b352181dbc21db2820e
font_01_sfnt_off0000d281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD281 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA93 16324 bytes
SHA-256: ec1e6c0586461d964d9f18b3e6e6772aece20efd2e6219f9a403f6bf6968b8db

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