Malicious PDF — malware analysis report

Static analysis result for SHA-256 b20b0d755e01113e…

MALICIOUS

PDF

83.2 KB Created: 2021-09-21 02:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e927479e53aca5dfc5ac7fe791b7160 SHA-1: a702943a77a4be0691c95042b4785438408c57a9 SHA-256: b20b0d755e01113e01ec8bc8ac941b2ba8ac86223ccdc9be9fa7eaca3bb97d63
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifier indicated high maliciousness. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to host or redirect to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nomylo.ru/uplcv?utm_term=how+do+i+get+the+chosen+app+on+my+firestick
    • http://leebyenghun.com/new/upload/board/files/70702313599.pdf
    • http://grandfiltr.com/files/file/soxoxulunedipo.pdf
    • https://sahyadrisevasanstha.in/userfiles/file/tudejivanuw.pdf
    • https://camelcarpet.org/d/files/75310893792.pdf
    • https://sooryasales.com/uploads/file/32600705089.pdf
    • http://royalleasingny.com/admin/images/file/kewuv.pdf
    • http://dachastyle.com/userfiles/file/35329816547.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/b2becb7312a10006a1dd079ce3c0d868/besin.pdf
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/78720661688.pdf
    • http://studiopol.it/userfiles/files/2815465523.pdf
    • http://abwcrainhwy.com/uploads/files/9810524987.pdf
    • http://midel.me/userfiles/file/12872144650.pdf
    • http://aqgwegfjdlk.handyfriendship.com/upload/files/20979198370.pdf
    • https://www.anoregmt.org.br/ckeditor/ckfinder/userfiles/files/wuzebukumupukolasiwel.pdf
    • https://cyberbirddog.com/userfiles/files/59401704849.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/5c8a60af66a779476b67f39e76110189/xodaveduxanesojotuz.pdf
    • https://rizecanreklam.com/images/file/20076251087.pdf
    • https://egyptsuntours.com/userfiles/files/rozapidafenifuvef.pdf
    • http://inimtrento.it/userfiles/files/gitariwufexo.pdf
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/dusenatuxusevixepobilal.pdf
    • https://eseninternational.com/uploads/files/5001940140.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd9b.bin
01d82815af0ab19f4a0b803e66334bcb4957af4944a84b069eda89b84a65046f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9B 18144 bytes
font_01_sfnt_off00010c94.bin
c4772ae0475ee60c4b2dfd7c84a8bbe32478aced1d15a7cb43342885fc3480cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C94 11304 bytes
font_02_sfnt_off000126c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126C9 16792 bytes

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