Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56fdc38713de6d9…

MALICIOUS

PDF

77.8 KB Created: 2021-09-26 13:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e12799f77374810ccc2fe10776cb2079 SHA-1: b3c630654c93e40cd9e87c9394bc78478f9090e8 SHA-256: c56fdc38713de6d9f8f83d09969846a9da12eae2d3ff73ecdfdd65a192d9814d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cargoservice.pl/cargoservice/userfiles/file/7195014773.pdf In PDF document text
    • http://patriabrno.cz/userfiles/files/34412189139.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613d442b13a1c---bowid.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/romufelinilifevokafa.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/dozisivapunofakurowasejo.pdfIn PDF document text
    • https://musluogluotomotiv.com/upload/ckfinder/files/69300802660.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/49051675770.pdfIn PDF document text
    • http://mytrangroup.com/uploads/userfiles/file/68316061899.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/bivabubekefizenofimosural.pdfIn PDF document text
    • https://crv.dascalita.ro/app/webroot/files/userfiles/files/bozivupum.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161314fe753240---ruredel.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/92040037901.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/saxegilabakabegiravi.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/43758308196.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/26067074895.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/58168168163.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161301a86f194a---62929580424.pdfIn PDF document text
    • http://posuni.com/userfiles/file/36350484107.pdfIn PDF document text
    • http://teakdeck.pl/files/file/rigolamirimug.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/30751993953.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/23025806479.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/jiximatituse.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/jabamagudapen.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/59376885223.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/79963272901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=laurann+dohner+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_off0000c52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD45 10248 bytes
SHA-256: 64bf6308ca246119c08ae058ae03e675145662e0712adf906e1b170567472641
font_02_sfnt_off0000f416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF416 20440 bytes
SHA-256: 930cc470d24b9fd72e7697cbfc3ab688d6d6a9d9841dffbb5920ffd468b74a04