Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f7a026050232dc…

MALICIOUS

PDF

83.8 KB Created: 2021-09-12 14:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d653b4b8f40c58cff5b1e49fa5682bd3 SHA-1: d41aa4e46263712512bf7d3a4579e4bded0906fd SHA-256: a3f7a026050232dcd3a63748130f7afe86eddf9574f72ed25589f3a47030e142
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nadiadsa.org/userfiles/file/podopisek.pdf In PDF document text
    • https://deltagroup.bg/uploads/file/60761046702.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/17722194237.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/xakevomado.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/4824501374.pdfIn PDF document text
    • http://fteq.ru/files/file/bugixepadatoximod.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/bidobiwoxok.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/tugawur.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/22795232131.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/9071669840.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tusibubejopabixamub.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb7da9f994---93838249722.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/37343504938.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/tuwurumefeladanelas.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/giwatedufadana.pdfIn PDF document text
    • https://braus.uz/images/shared/file/sabuna.pdfIn PDF document text
    • http://goodmax.ru/i/files/pekokodibedejaz.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/mejude.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/64174051204.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/26184758606.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/31569894586.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/16372886394.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136029bb8c95---xogofe.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/75020695716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=wear+os+open+sourcePDF 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_off0000e1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FB 10224 bytes
SHA-256: ca02beb19daa2da8ac5bd2aea4b56e61f9bc73da8ecefe0d0a9334190fdf1473
font_02_sfnt_off00011111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11111 18684 bytes
SHA-256: 9e91d550968fabbb5588bcfd4e38177c595c872bb115606370fc07bcc7f6830e

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