Malicious PDF — malware analysis report

Static analysis result for SHA-256 1164ff7650356a42…

MALICIOUS

PDF

72.8 KB Created: 2021-09-13 20:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13294bdf70b8f8ea1a194a78cdcfcf77 SHA-1: 4288b77bcecfb04b02fdf3b5a9c7a5092b446a76 SHA-256: 1164ff7650356a42e16d10ac526243aac9412dd005dd500f471deb833dc813a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains, strongly suggests a link farm designed to redirect users to potentially harmful content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns point towards phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=pokemon+ds+hacks
    • https://ingatlansos.hu/images/userfiles/file/nupedawisifititipodifa.pdf
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/88339192752.pdf
    • http://www.depomatrial.com/file/ditorapekel.pdf
    • https://inprovituruguay.com/ckfinder/userfiles/files/wogefozu.pdf
    • https://igraonica.me/userfiles/file/xesalukobo.pdf
    • http://telegid.tv/userfiles/file/xibasizota.pdf
    • http://hb-hospital.com/file_upload/fck_upfile/file/36711375435.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613f59ad95cd7---fezababunodolalodijomat.pdf
    • http://infosierra.es/images/editor/nujazafekesafag.pdf
    • https://bbu.vn/Images_upload/files/54712437392.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/97o30ovih1jt8g6pkpqj97iobd/betasakinoragepojaju.pdf
    • https://swagath.co/new/ckfinder/userfiles/files/64735155881.pdf
    • http://transporteslaplata.com/imagenes_web/file/lufapuxeziro.pdf
    • http://k-sta.kr/FileData/ckfinder/files/20210906_B8567AF14813CF58.pdf
    • https://csp-pub.com/stockages/files/15755111743.pdf
    • http://tehla.eu/userfiles/file/welajirubuzixi.pdf
    • http://cherryontop.pl/upload/fotki/file/karazupobusivetupabuxu.pdf
    • https://mkontroll.hu/File/83899824839.pdf
    • http://pscworld.eu/ckfinder/userfiles/files/85142277524.pdf
    • http://infinity8talents.com/userfiles/file/4459323804.pdf
    • http://tuttotop.com/userfiles/files/44842820344.pdf
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/45438549624.pdf
    • http://daiichigroup.net/uploads/news_file/10404949863.pdf
    • http://www.iciparis.ru/ckfinder/userfiles/files/zirefupa.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_off0000b8d0.bin
5bea7ce74ff427d4c9bd8b8cabc42ee7f343da46fa813158a2648d50436010ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D0 17584 bytes
font_01_sfnt_off0000e6c7.bin
8aa0e32205d61dd45d5cbe563fa8164f72cea9ad17672bfd9ec90fdd925765b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C7 10392 bytes
font_02_sfnt_off0000fe21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE21 16792 bytes

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