Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66b7b430e076df5…

MALICIOUS

PDF

82.2 KB Created: 2021-09-26 04:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: eb48e88cab30d864e6a8dc7ff32a795d SHA-1: 6fd2355ab6cecf5af8e51dd8b1ec24f7a95a8104 SHA-256: a66b7b430e076df5f0f46bc4573f08164b50b674c22982084ee21eb5305dfce2
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 directing users to multiple external PDF files. While no scripts were directly extracted, the PDF structure and the presence of numerous external links suggest an intent to redirect users to potentially malicious content or phishing sites. The `wkhtmltopdf` authoring application is noted, but does not directly indicate malicious intent on its own.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.casasemio.com.br/ckfinder/userfiles/files/lewexajemurowugerukeg.pdf In PDF document text
    • http://szkolka-wiercioch.pl/files/file/fufujobifibunuzunimetozen.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/7938044356137cff633dd6.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/zomov.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/vimalefexumafadoxegug.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/zedinoselilobuki.pdfIn PDF document text
    • https://latework.cz/soubory/84700677723.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/kidimojukezivize.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/jafiwagusenexakividugulo.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c537c3eee---tuvetafofafa.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/vubali.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/loxapevadegofozu.pdfIn PDF document text
    • http://plan.msu.ac.th/ckfinder/userfiles/files/47346403136.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/fegudakonudivikalotudo.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/17688210878.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/gufudosapogipiwekagasulef.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/mikidefotovizajefi.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/641c8840930d3059747ac44b47aa7725/71653894398.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/95818515808.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/13134770282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=save+them+all+drawing+puzzlePDF link annotation
    • https://b2cdemo.tickets.com/content/files/87335134109.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6F 10936 bytes
SHA-256: b7d6a47f1312e132d77fadc1be0622f4a0321988d3b22495fe03f09ab62a3fb8
font_01_sfnt_off0000d86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86A 17380 bytes
SHA-256: a74c10de31592c1002bfe2cde1afc40e81293add75c577387ee47cb9c1338d78
font_02_sfnt_off0000f294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF294 17892 bytes
SHA-256: b9d0a81bf4dc4daa7e62f39fe36ef70d720999ce8de4183b3d03a76820a8dd49
font_03_sfnt_off000120f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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