Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fcf54932392d251…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 04:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4cf3050e5770ca71833b75d6903a3d74 SHA-1: 9067a5bb1fab70aecf7fa6e19f66d4c8487bc53a SHA-256: 8fcf54932392d251608dac1da50039050c047f9d16e9e553ffda184850139b21
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host multiple links, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggest an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://tennis94.fr/img/pics/files/44252943038.pdf
    • http://optimaglobal.net/ckupload/files/57767329762.pdf
    • http://megaprestige.ru/uploads/files/bejavukupixajepedo.pdf
    • http://curvesncontours.com/userfiles/file/65472306.pdf
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/24646551481.pdf
    • http://tai-yang.tw/taiyang/upload/file/peludajulatewo.pdf
    • http://proleague.dk/userfiles/file/28198703506.pdf
    • http://rovitek.com/userfiles/file/nixefubedagumoripelumul.pdf
    • https://marcuspietrek.de/MARCUS/files/file/pesub.pdf
    • http://lsphc.com/userfiles/file///42739242865.pdf
    • http://eiak.org/upload/editor/files/69371796083.pdf
    • http://longruiglass.com/ckfinder/userfiles/files/20210909_152004.pdf
    • http://monticellotownship.org/userfiles/file/lugikujalunab.pdf
    • https://bimore.vn/webroot/img/files/89937257628.pdf
    • http://zoekidsworld.com/userfiles/file/94915737854.pdf
    • http://cuatro-pr.org/sites/default/files/file/xizovorosupag.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614238d03ed99---jetusisipepuki.pdf
    • http://sportsgarten.com/editorData/file/91586525432.pdf
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16019246585.pdf
    • http://ymmicro.com/files/files/29139451783.pdf
    • http://gwardiajuvenia.pl/zdjecia/fck/file/dufijulisudosewi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=chemistry+form+5+textbook+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afc0.bin
851224e5768b76f9051e18c3cd0adf1585998a7603268660e7b6b3be4dfbcc60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC0 11064 bytes
font_01_sfnt_off0000c965.bin
671135bb9a83c20de601020f31e26d88a5fa417156f034313e65526117687256		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC965 15768 bytes
font_02_sfnt_off0000f1a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A3 16792 bytes

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