Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8846a0baa0e079…

MALICIOUS

PDF

76.2 KB Created: 2021-09-12 19:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6ce5e83712d81c5bf0cc4d55bf033054 SHA-1: 4dd62ae683e9803bc67453380d9342fdb52fcde2 SHA-256: cd8846a0baa0e079390eaac03f31beb41fafdd0788f82f018e1e34a9c07c8f2c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. Multiple embedded URLs point to external PDF files, suggesting a multi-stage download or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_URI heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://boldino-hotel.com/ckfinder/userfiles/files/70126222226.pdf In PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/segamakilaliduwix.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/tasijomitojumubi.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/13175248572.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/muvivalegunakaxesixizof.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/jonodexawenawatinaguri.pdfIn PDF document text
    • https://kildevangen.dk/files/88126039490.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/jokonawanomesiwamafosifum.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210907_031949.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/juvagaxopiwexezozifibu.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/fawipepogekufikoworogale.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/39277098189.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/50835625441.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/vitir.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/nowanawelagadojugimorika.pdfIn PDF document text
    • http://nincity.de/inline/file/bugujositaroroz.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/55417611232.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/joxanimuxugos.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/vedimutomujusefajagubiv.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/66368953078.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f87590f115---pesiruma.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/mixekelep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=roms+snes9x+ex+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_off0000c3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A0 18264 bytes
SHA-256: df9d5736501817d1624b1d5778e7faf56e7a2d47aa7138ad7ba9fdd8fbfc97d1
font_01_sfnt_off0000f356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF356 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6D 10580 bytes
SHA-256: 817755163accb1164436b46d926914f43fe2ee35b2bfd8426b960c78cd99e00a

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