Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b4faadda7166e7…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 13:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8ee92c5630960a58c3a4974de9364bdd SHA-1: 42f23f92d86a7328fb58e7f0a21c1b8b96faca57 SHA-256: e8b4faadda7166e74876abadfce40ce65d6cb9dfe00080dce0d9b21e6a86ab0b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous unknown URLs suggest a link farm designed to obscure the ultimate destination, likely a phishing site or malware download server. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132455e1d849---xezidenabebunedogex.pdf In PDF document text
    • http://sydjpg.com/images/upload/file/20210909_112333_166.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/xuxalikilip.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/vupelakemelikanifig.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/gazubopexudetesadomidola.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///62289877948.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109091051465434.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/1075092903.pdfIn PDF document text
    • http://vititanon.com/user_img/files/74444285372.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210910060456.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/66904805982.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/lepuraxamodib.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/49049673344.pdfIn PDF document text
    • https://mklaassen.nl/images/file/jugosatuliv.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/febolupuni.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/94180319804.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305abd30d17---poxebag.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/15426257234.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=classical+guitar+plans+pdf+freePDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/69073311408.pdfIn PDF document text
    • 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_off0000af31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC748 10804 bytes
SHA-256: 2eb5884567ca089fe9b02b943356250e00a6c6bf2e21bc8fb4fcf6b2eb86cb2d
font_02_sfnt_off0000e01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01F 17332 bytes
SHA-256: 2d0267e459d7682ef0a320578ab51fbc5eb99cbec3b5f720782f4bc1a32ad6e3

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