Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b23a5b5136012d…

MALICIOUS

PDF

121.5 KB Created: 2021-10-05 21:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: abf4f406f6f096cc24366d45ed1a09c5 SHA-1: 2ca1782f4f5bc7a9967d4bbe0e54edf1564b6c41 SHA-256: 65b23a5b5136012de2ed9cf1f5d789ed6ecd59bf328d5b4f7387b2959b84efba
126 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing lure. The presence of embedded URLs and the 'link farm' heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://edex.co/userfiles/files/79108282733.pdf In PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/fugelowivunugazerajiwusa.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210923232054.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/88976656684.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/rusowiboziludede.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/39668189277.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/kesuk.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/31144447119.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109280056568482.pdfIn PDF document text
    • http://zenkatsu.dk/files/73863539583.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/solilukireburizipaz.pdfIn PDF document text
    • http://neowork-rh.com/userfiles/file/14627171352.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/99928674644.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/jozomeninerug.pdfIn PDF document text
    • http://greenld.com/userfiles/90561624355.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/84525202646.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/65656659417.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/muvopo.pdfIn PDF document text
    • http://eichler-kammerer.de/wixozogovawixijezu.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/dbef84fa4cbba9fcfb8e135d21cdada3/80235198417.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/45838773401.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/nibofutazitinitozidaguf.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/46108987771.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/zazazigifoxogufuwedufezu.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/dalisuzaleb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+musician%27s+guide+workbook+answersPDF 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_off00016f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001875d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1875D 11088 bytes
SHA-256: 7a23273f5fe416eecc1a68babbfd13865f421bfa78fbf8c3c2ab42615b2750c5
font_02_sfnt_off0001a0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0EC 21104 bytes
SHA-256: 66e2c860933ae4bd0e09da8ae432b9f1bb9bfc1d1573427a0cfc8c9584d9a074

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