Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee35f12a2d7a72d6…

MALICIOUS

PDF

76.1 KB Created: 2021-09-27 22:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 598edfce17debd329c168ffc99138cf1 SHA-1: 7fdbce7b9a2c4a81f55a7c72923063bb5d87f050 SHA-256: ee35f12a2d7a72d6a3ee842478a01f20e6a54fb2a878a57c44c944c814a3275e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that redirect to other PDF files, acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the link farm behavior, suggesting an attempt to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://chcial.ru/uplcv?utm_term=famous+tamil+novels+pdf+free+download PDF link annotation
    • http://ghalemdi.com/userfiles/file/84308381861.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/80784760401.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/wevomibusikimurowoli.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/xibekijikezoje.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/kiletonapal.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/8gc5fbppch2l1mv4f7pes8co35/40136580422.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/4480189698.pdfIn PDF document text
    • http://tid.vn/upload/files/zinomexoxiludabi.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/vugafisivunu.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161460032580ef---dibitowewuwegene.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/rutet.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/15092930323.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/robivafafo.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/42473252401.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/89761666762.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/jixot.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/xuzuzofebuzajogemururol.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/13200759732.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/48762436599.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/penozogapubelu.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-2/20210902042940945886.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/zajafolin.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_off0000bfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D8 10888 bytes
SHA-256: e4a812e1527d59f6b061959d85e449d416be1b65e4c5d34162fd0a3837dfb30f
font_02_sfnt_off0000f10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10F 19068 bytes
SHA-256: ec60c38ac75a48751a0c627c7ed12a86e00ff649b7e758d24b81229e8d88b110

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