Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a9856b818eb93f…

MALICIOUS

PDF

73.4 KB Created: 2021-09-17 20:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9673de1ebd84243cc0cc510af7cb4768 SHA-1: c1849693d9cbd67e70cea4be1859eee8e2ccd569 SHA-256: c8a9856b818eb93f58f6e51163e60544376b4807264bf2b482f333ba1be707e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to obscure the true destination by using many distinct hosts and redirectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://pixomot.ru/uplcv?utm_term=harry+potter+2+free+full+movie
    • http://fluitec.fr/ressource/site-image/files/junizifejeronivej.pdf
    • https://m-astar.com/UserFiles/files/fibexevunosefokav.pdf
    • http://genarchi.com/data/temp/file/75922537016.pdf
    • http://engineersclasses4competition.com/files/others/10459303663.pdf
    • http://spl-designs.com/ckfinder/userfiles/files/bilib.pdf
    • http://emirates-offshore.com/uploads/image/file/13330830240.pdf
    • http://langeline.com/ckeditor/upload/files/vuvuwalalenosemamed.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe2f7b0200---bewajuf.pdf
    • https://steklo-shik.ru/userfiles/file/gelodu.pdf
    • http://sirinthepgroup.com/userfiles/file/filek.pdf
    • http://ainut.fi/userfiles/file/kigusijajukunegu.pdf
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/46147016061.pdf
    • http://psychologadamczak.pl/userfiles/file/vifowabazugenibutidaj.pdf
    • http://suaups.net/userfiles/file/zatifutefif.pdf
    • http://grandioso.asia/editor_upload_image/file/78206063135.pdf
    • https://berbagiangka.com/contents/files/jimup.pdf
    • http://arucax.am/user_images/file/wujegitowadide.pdf
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/vefivamudisaji.pdf
    • http://gartenstadt-apotheke.com/userfiles/file/85737195682.pdf
    • https://85097781.com/upload/files/motujesigozuv.pdf
    • http://myphamvickwhitebeck.vn/luutru/files/64700035535.pdf
    • http://chocoenglish.com/_UploadFile/Images/file/70598738111.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_off0000b8d8.bin
e27a748cd31c658b3f1465d48241617713970a6e009df93ede7edfab21c162ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D8 10636 bytes
font_01_sfnt_off0000d146.bin
eb07048558fa30410a4ece17e95e8871915a39e40854e63b098c8016ccbe3217		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD146 17912 bytes
font_02_sfnt_off0000ffdf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDF 16792 bytes

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