Malicious PDF — malware analysis report

Static analysis result for SHA-256 9912aa437de54cbe…

MALICIOUS

PDF

78.3 KB Created: 2021-09-17 00:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ae3ff5a2cebf8e4e084c8e95f174b28b SHA-1: 9787a455832b1362139f447493af026c49c3db74 SHA-256: 9912aa437de54cbea0776185d9c66554057f5626bb571cd2ad92bc896ff270de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves directing users to a collection of external links, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb510af88e---fomajovubefafojejeja.pdf In PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614184c818619---2410698731.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/4135062070.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/ludosumirakegibowexo.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210913185409.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210910065740.pdfIn PDF document text
    • https://phunhai.net/upload/files/fozomo.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/48087517205.pdfIn PDF document text
    • http://baove24h.org/upload/files/84823247109.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/39559714797.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/7907386726.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/totibumasodenokimepilop.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/pugoromilitipasopewawareb.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136fe6328a92---77541462980.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/27632551205.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/wipavofonu.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/41299028718.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/44205533889.pdfIn PDF document text
    • http://stylekd.ru/files/95092858651.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/29439406868.pdfIn PDF document text
    • https://viceda.com/userfiles/file/jusesu.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091319174217.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/buwijowutopidewalexopit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ppsspp+game+files+to+downloadPDF 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_off0000cb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE395 10828 bytes
SHA-256: a99ff65f44e6003cec5f742779b58c1a6c133c49b433679c17ec98c387a5e875
font_02_sfnt_off0000fc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC64 17972 bytes
SHA-256: 478e30c08d38a41b137df3ee0a8c9700af012bd4ff171469b819181aad62d156

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