Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4908740f1cb46fa…

MALICIOUS

PDF

79.5 KB Created: 2021-09-13 22:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1c1d7ff2e44e1b1de85ff450600d066f SHA-1: 1d9f35707f32a94650c2e585fb93210d4d5237ad SHA-256: e4908740f1cb46fad9852595f6cd8f9de8a3a5b2bb5ded723a7d9346398ba494
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs to execute code or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest an attempt to distribute malware or phish users by directing them to potentially malicious external sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://studiogeologicotrilobite.com/userfiles/files/dibuxufamelepabege.pdf In PDF document text
    • http://westernmaki.com/uploads/files/kunawutovo.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/tewejifixolatoxafabudan.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/74523529497.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/7571335779.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/amcdkmhb8qpiuh6qbimo9ukkck/lobepezanab.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/99127861275.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/vesedotedusok.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f783deccae---geguxefavalipigoguwif.pdfIn PDF document text
    • https://ms01bet.com/contents/files/31238368902.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/xilagigolaborik.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021090622550973499.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/75575803983.pdfIn PDF document text
    • https://o-dance.com/upload/files/42645807533.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/34077133242.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/55995688118.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/35550861178.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/bujun.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/dasuvedidejojevaf.pdfIn PDF document text
    • http://krupongs.com/images/file/lukufitizam.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/lijusuxaduj.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/jogukipul.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/74343539507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=programmare+android+con+visual+studioPDF 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_off0000d193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD193 10880 bytes
SHA-256: 85bacc2583686cc1f57f879ef54f8b7e47673fc42d911f512137a1984f175f46
font_01_sfnt_off0000ea94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A6 17520 bytes
SHA-256: e9b0dd35dd28c431ecbbd86e8ce87929f9cfabbf7b27cdd3e1ee1f9c120b4bf1

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