Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fde0ce450b88243…

MALICIOUS

PDF

73.4 KB Created: 2021-09-19 22:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ffbf0c2ccad3865f8160af7a3c7c8b3d SHA-1: c8a7e026da67f41c9f75beeebf8a39e67d5c62fb SHA-256: 2fde0ce450b88243e1dde1a5ff7c05e8bcf7ef1e77982b82fb80cc00a26d988c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to PDF files, suggesting a link farm designed to redirect users. The presence of a PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure malicious intent through a large number of low-reputation links. No scripts were extracted from this sample, but the overall structure and URL distribution strongly suggest a malicious intent to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141435b6c40f---18331870886.pdf In PDF document text
    • http://www.chubsorn.com/file/files/86183767293.pdfIn PDF document text
    • http://aa-nusd.jp/49274712944.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/15330067972.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/pijepevefifuxu.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/sagekibanidujisemar.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/58470595635.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/30871924993.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/jupidoxojirerijebiwujaf.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/taxavuwotiganubekixosikaj.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/buvavuvomebobibekoxij.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/30256416807.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/petulelupopukiburi.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/xezoberogi.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/nojiru.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/xewoligiga.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/golozisomafo.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161415556d63d5---98876407775.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/34635644405.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/zofefozim.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/41975825668.pdfIn PDF document text
    • http://na3.it/misc/file/biburogediwewolexevofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=mario+game+super+mario+world+rom+hackPDF 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_off0000bce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE8 16392 bytes
SHA-256: 235be2ed349c3687a47a687d79c971df16f4ecca0659a8c35fc139a2cdee4d8d
font_01_sfnt_off0000e6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF08 11028 bytes
SHA-256: 49ee21c67d837087ab4f200f36b086e644ca9b6dccf095991555bf2323c58878

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