Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be6ebbab8b0ce5f…

MALICIOUS

PDF

95.1 KB Created: 2021-09-16 11:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 95d59d00d3ae1e968aa6b92d50de00b0 SHA-1: 2da5537f5eb4501fe9ab74554f233d781d4612b7 SHA-256: 5be6ebbab8b0ce5f054a60f3bee089b7a373d8ce79cd384488759847efb83825
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed for phishing. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://www.hmgfinance.com/ckfinder/userfiles/files/wumeled.pdf In PDF document text
    • http://tartak-monis.pl/tartak/images/file/86193773025.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/89659942791.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210908_003710.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/96142492681.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/87573590441.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/47969974589.pdfIn PDF document text
    • http://fohow77.ru/upload/file/31988220755.pdfIn PDF document text
    • https://baptistfriends.org/media/kuwamepapibep.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/21214264335.pdfIn PDF document text
    • http://rcot.org/userfiles/file/guwukedujilunapaj.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/81575412904.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/mufumuzasufazaf.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/rurobiretixij.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/39056266550.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/woxitozaviwokubuwivoxu.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f461858836---30179368631.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/sidofibanusekijuxanod.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/75041591932.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/40016043892.pdfIn PDF document text
    • http://gibisch.com/files/files/99030886692.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/gunodutuvufo.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/57836418456.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5bac21078d9e9ef638286774f0006f8c/turilagomosezitupasirune.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210914082016181.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/52188719076.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/dinamorajok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=rig+veda+pdf+in+bengaliPDF 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_off000108f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001210b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210B 10440 bytes
SHA-256: f25876adf48accda20e8f5c27b5433ab37f2af685df9ed9511f170a9944ea772
font_02_sfnt_off00013857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13857 21092 bytes
SHA-256: 4ae47ed37de225be1a4130b661306bd3bb7bf849907c935b1d7f9a0862b7177c