Malicious PDF — malware analysis report

Static analysis result for SHA-256 4258d71be97da8ce…

MALICIOUS

PDF

77.5 KB Created: 2021-10-12 23:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-15
MD5: e4fa539b4f8d00ec37ad0eed68d43923 SHA-1: f3f4e2fab1ee2d8bb75482f5a699fd6d5952538e SHA-256: 4258d71be97da8cea29b3efaaf215489fa30e571b8136b0852db90a477e669a9
134 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://grupa-energia.pl/attachments/file/36984687988.pdf In PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d76d25566---zedugovukezusumudikowud.pdfIn PDF document text
    • https://bak.vn/upload/files/43006593662.pdfIn PDF document text
    • https://mihalex.by/files/files/pevelomuneber.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/28864746317.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/34333185545.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/binaridenowodotivas.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/39553081129.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/23302321264.pdfIn PDF document text
    • http://krzeptowski.pl/file/72437021864.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/subep.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/36481177299.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/8992638142.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/sogebogalewusi.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/76703644309.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/10589156267.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/56356778875.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///kufolebagadituwagujogak.pdfIn PDF document text
    • http://apnm.indexint.net/ckfinder/userfiles/files/befubopusofe.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/setusibesobobawog.pdfIn PDF document text
    • https://rm-parketi.si/uploads/sirudunakiro.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/fokavexapawemoviwen.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/2I9n2o-U8HI/uplcv?utm_term=beautiful+morning+scenery+imagesPDF 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_off0000c928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC928 17948 bytes
SHA-256: d535b3cf0c08980aab13624438e6ad22eeeda9f83a01a648559183d585165a23
font_01_sfnt_off0000f6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F14 10948 bytes
SHA-256: 3ddaa1d8c9e4e00d0bdd6d7afad0da7612878aa99bb94801f72e02a1e197ae04

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