Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6dd965ecb4ca59…

MALICIOUS

PDF

74.4 KB Created: 2021-09-13 10:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7b77433d82411a20b76fabcaa5f60a1c SHA-1: 8dd4856dbaef745292b4917d8d0b15cfe4c1eeee SHA-256: de6dd965ecb4ca59c965223dde9e5da836a8bf83d57d8723668ba24d0da07958
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, suggests a link farm designed to redirect users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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://archism.ru/uplcv?utm_term=fortnite+alt+account+generator PDF link annotation
    • https://whereestar.com/marinarubicon/admin/file/90160045881.pdfIn PDF document text
    • http://termocity.by/pics/files/xoserujopemoronivusaxumo.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/kixekebokog.pdfIn PDF document text
    • http://acelybio.com/upload/files/ridinixo.pdfIn PDF document text
    • https://spyboarcams.com/files/zunugukukawipaji.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161352a9832326---kamamuvemuvowogejenakapur.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/41816167596.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/nogamirusuxuvomunikopobad.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/35113804511.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/91749642478.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/62193877393.pdfIn PDF document text
    • http://agavietnam.com/img/files/1492687437.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/bamixuzuvuzo.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/zilexines.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/7852589630.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/wabezotiwerabokiwunusis.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/vitozotigupojisefexide.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135f67268d5e---85084328691.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/tiviwusarofujitiluduvuv.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/sufoxifugusibirisula.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/73856209290.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/86655006620.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/baxukelumesuwebakiwom.pdfIn PDF document text
    • http://kco.su/userfiles/file/40691245394.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/zepojitonaporugexok.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_off0000bfc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DB 17380 bytes
SHA-256: 4a6a4b1f6cb718f5606dc213bcee1568f3671002e38b9e472f319033b90b443f
font_02_sfnt_off000104f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 10316 bytes
SHA-256: a6ccdffe1f75c07e5f85f9c88ea799f89ab9e9af43179ee1e48285dcd517a758