Malicious PDF — malware analysis report

Static analysis result for SHA-256 6178e369ee1a2af6…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 19:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 92f332d626ba07c2013293ffc46f2eb4 SHA-1: 80507b5797fdfa0c20ae80e9eb7190ec62f786ae SHA-256: 6178e369ee1a2af6fb97d57fc99df3d302f036d78ac2221fd4121b37830dc63b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URLs, with one specifically identified as a link farm designed for redirection. The presence of embedded URLs and the overall structure suggest it's intended to lead users to potentially harmful websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://infrive.ru/uplcv?utm_term=music+player+app+with+lyrics+offline PDF link annotation
    • https://soportedevida.mx/ckfinder/userfiles/files/87283474392.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/41297661976.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/makujo.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/61503203998.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc4245289d---vitiwefidojitozovefa.pdfIn PDF document text
    • https://temahr.hr/files/73102992434.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/noniji.pdfIn PDF document text
    • http://intertravel.hu/_user/file/bezevebe.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/rinodamusedamiv.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/12406176028.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/20097877859.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/47244338569.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/13237496515.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/97208401852.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/kevuvenafedunivefifa.pdfIn PDF document text
    • http://opersan.com/file/wisesubewuvalafakisafe.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/dataxa.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/73937643099.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/58846328982.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/55556469739.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/farumanumiladotaruvo.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/rabaxiluvino.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c991dbd5b1---daderimim.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210918053747604602.pdfIn PDF document text
    • 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_off0000df67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF67 10868 bytes
SHA-256: 885e8fd23e26ff7ad5e96579537770d10ec4033e9a321a6b956455344ab16183
font_01_sfnt_off0000f890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A2 16932 bytes
SHA-256: 2bb847a0519807c1530c078db432c794387b36bd484277db9e58eba4c27d2020

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