Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fda68d0e9ebf833…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 16:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e2a815c2561433d044f09816fd87d0b9 SHA-1: fb40b40c0fd030b3737f44d6c28b2cb6f41c952c SHA-256: 2fda68d0e9ebf833907681d9fb5a67a5c0a738c7075ac474b0a591dafc12e70c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which are hosted on potentially disposable domains, suggesting a link farm or phishing lure. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://corporatiegids.nl/uploads/files/nojotimonexez.pdf In PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/vojunamusufu.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/79299313212.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/wegep.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/fonanatajajawuf.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/03944e26ec67e2ef92ced950293b6004/fosujozagetikadineva.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/wofixusefinanusak.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/rirufajoxoba.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/7221381828.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbda605cb1---84305039103.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/91732792117.pdfIn PDF document text
    • http://surestegc.org/documentos/file/79897342564.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/80855256502.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/76878009304.pdfIn PDF document text
    • http://limoride.net/gallery/file/gibigejabesaj.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/modoruwawujul.pdfIn PDF document text
    • http://katachizu.com/img/news/files/68967655396.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/roluvup.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/14573363362.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/73138994725.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/fuxuvununoziwiwewigil.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/4082501375.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/tanolijujuz.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/61594270133.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/xuzox.pdfIn PDF document text
    • https://t2sc.me/userfiles/gigoxowibametozavup.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/92307107606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=las+batallas+en+el+desierto+de+jos%C3%A9+emilio+pacheco+pdfPDF 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_off0000d621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 19560 bytes
SHA-256: 7b8f920434c53a27c60f6ecc72bba163f0195b1afbb2fab1cadce7c255ff021b
font_02_sfnt_off00012092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12092 11264 bytes
SHA-256: 68c0d0905a39aec19b2f83e6281dee76b194cf7e7eb97e44ae75edf99d7a2fb8