Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67766ee31539d99…

MALICIOUS

PDF

69.6 KB Created: 2021-09-30 15:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3c84b979630af45ffbe8f54ec515fed5 SHA-1: 94539fc846fe435b2d12d6ef477b7db4933dd022 SHA-256: f67766ee31539d9915cd073d12285d4839dd0685c7ef3226ebc324c550c39bf7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://revive.fashion/upload/files/lokawasupodowaxanilaz.pdf In PDF document text
    • http://finalbrand.cz/upload/file/14880407709.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/fetusiwot.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/73513218041.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/xezujemokesukumonixed.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/vatidopuw.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/80752343027.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/rilk0h6lunb9al5pjki4hk9oq7/6766384926.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/22312723407.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/39682462130.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/jedoj.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/13154599109.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/rumusi.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/108473031.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/21090182734.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/91329021395.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/ferekunidunotawisinu.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/fepatoxodaweviwij.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/logapo.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/kebigeleso.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/rojobuzavigiderale.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/77560511809.pdfIn PDF document text
    • http://budropol.de/Upload/file/zewabewetujeribezijej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=cs+online+cheatsPDF 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_off0000afab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BD 16660 bytes
SHA-256: f7875ab20e8ab42111ec7e81f35373e9f243a9dd60c02a89573714c9213525fb
font_02_sfnt_off0000f245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF245 10256 bytes
SHA-256: 07fccf3a8e40c217961d790b5a17b32cb12ffd100b6a88d750a9cf466f91ad3b