Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff0cdda10a26851…

MALICIOUS

PDF

84.8 KB Created: 2021-09-14 03:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0091bfe5f416585427a7173f654d5dec SHA-1: f565ce01c6a01335ea216145f42db709ee3731b8 SHA-256: 8ff0cdda10a268512127580376c8f6c6782c39d7aa6b31ffe177a936a6442524
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. It contains numerous embedded URLs pointing to other PDF files on various domains, many of which are unknown or suspicious. The primary purpose appears to be directing users to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://birudongker.com/contents/files/37764703799.pdf In PDF document text
    • http://alfavs.eu/userfiles/file/14519503310.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613b18063c41e---14401255789.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/lokakupepumubav.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/kapezi.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/19608390714.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109131925282074.pdfIn PDF document text
    • https://parfumzone.ro/files/file/42387827065.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/mirijitulowabim.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/nivudofaluwuzu.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/42178462933.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/wozukig.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/19541864381.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/43165102193.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/vulewaralesoperopofu.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/37605472077.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/pogoruxovadexav.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/ximezumatijos.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/jaxazejagev.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/zedubimotubimubijofig.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/97090223475.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/naloj.pdfIn PDF document text
    • http://tion.hu/upload/file/63767067864.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/87649207487.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/55957059537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=what+do+symbols+mean+on+androidPDF 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_off0000e693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE693 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA5 17756 bytes
SHA-256: 06dc90a9371acc6defa8d84bbe61e993143e3d1237a6c7bd362e3501c7488698
font_02_sfnt_off00012c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C84 10760 bytes
SHA-256: cd0260448d0782a1192c30088afc461505e324a124b14d5c0670dc538524779f