Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40926df23f8fad4…

MALICIOUS

PDF

82.5 KB Created: 2021-09-10 01:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f4ca88cd7e6697a4a2c2e5fd0f2b5d8b SHA-1: 80dc3fe9b1f2f34e5a14e16e4a698719fd0c7cbe SHA-256: b40926df23f8fad430ad39c112c49b949d6a6d5e3f6d79ef756b868dd8689c5d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the presence of embedded URLs and the 'Pdf.Phishing.Trojan' ClamAV detection strongly indicate a malicious intent to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://semineebrasov.ro/printuri-fi/files/571727623.pdf In PDF document text
    • https://cantarefides.ro/admin/userfiles/file/36203002431.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/samatemopufimi.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/94024624192.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/fajub.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/4838055887.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/lofaralofunogojene.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/pamedetonunivevulesagop.pdfIn PDF document text
    • http://haki.vn/uploads/files/88721763580.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/44634367355.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d939c5788---vuwelude.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/23061075330.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/xipemepinali.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/85672677319.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/96209328885.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/gutelagutipusad.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/79998247699.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/68768077675.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/b1bc14d13c69b560c18bd5312d642624/muxezevuxeveda.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/12409519660.pdfIn PDF document text
    • https://domilot.com/uploader/files/99250506376.pdfIn PDF document text
    • https://photofetimages.com/bigodalu.pdfIn PDF document text
    • http://halaljones.com/uploads/files/36363538693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=kanji+social+linkPDF 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_off0000de9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9A 18128 bytes
SHA-256: 3a2765041ae34f81e3c2805d8df76e0ddacbfe0c8b42d36ba67ccf031da85128
font_01_sfnt_off00010e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001266e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266E 10108 bytes
SHA-256: f07d8dc49436acfc583de0967727b317ed6298704707a48e4d91eae0a84fc0a7

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