Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce9201fac4f60283…

MALICIOUS

PDF

70.5 KB Created: 2021-09-09 02:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 11813db6d52cd26d88f9e73999e75006 SHA-1: 0eabea8b11d8d79e5d5508d9bc516c998e7c2960 SHA-256: ce9201fac4f602838f99b1a7f5f53943e34ceb91a240069a2f9566113b3a3913
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to disposable domains and form a link farm, suggesting a phishing or SEO poisoning attempt. One URL, 'http://bolshunoff.ru/images/wysiwyg/file/pisokafipawupobudu.pdf', is particularly suspicious as it is part of a link farm heuristic firing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://bolshunoff.ru/images/wysiwyg/file/pisokafipawupobudu.pdf In PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/11313556624.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/mulinine.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/40337493059.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/nivaforozuzulejelu.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/5337197056.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/suvagumazemiz.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/82069442402.pdfIn PDF document text
    • https://tsolisp.com/files/file/jedalarewininoxiw.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/forowatogi.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130300e4ed2e---63017981714.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/mevuzunadulomexina.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332ac50f199---vurofoxejekusuvalidi.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/memodam.pdfIn PDF document text
    • http://erimti.com/userfiles/file/beverotufoxegidejapobow.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/33178502251.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/55883040185.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/3311776568.pdfIn PDF document text
    • https://biodez.lt/i/File/koviputijopamunaj.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/netezovigenodiwiranatun.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/figagox.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/pegolut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=varian+hal+intermediate+microeconomics+pdfPDF 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_off0000b3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F8 10856 bytes
SHA-256: d523ca36d9539359cd8e4b706fb1e669898993313ae1188f8c660ec98335b422
font_01_sfnt_off0000ccc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC8 15896 bytes
SHA-256: 21f820769aea61e0ce94ba5490c7d3e275a3ab8c5be49fbdc612e88dd242ecf5
font_02_sfnt_off0000f466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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