Malicious PDF — malware analysis report

Static analysis result for SHA-256 36fb407c71f8ebfe…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 17:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5fc6110cab4cf7e8adb3e85321825f1d SHA-1: c8c7e561b76487572d2d40a6dbd63162fe53bb20 SHA-256: 36fb407c71f8ebfed7bfd04fe901fcb0ab90a8577206d58965c7198dd29e1c24
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to link farms, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/nitedigoje.pdf In PDF document text
    • http://kmjmt.com/news/upload/file/210916013053681528zv8xkl.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/wopawubaduwigoparevadapa.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/zixadukumi.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/37482338774.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/gadegokuluxinedikekexej.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/lumaputarudagat.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/05/43978876603.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/vaziruzafisivuredaxelom.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16130124e7b5ee---zivuwezenesator.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/38496172732.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/pubizokapirorazol.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/gopomebexaseri.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///moduzox.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/71227902783.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/94680321235.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/vukakenaxipudubov.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/vozekovepikeniketu.pdfIn PDF document text
    • http://partnercable.com/files/tuperelowoganepedijifeji.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/44717004569.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b91416d0f---74354032777.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109160447524147.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/batokosefunexunamokajagos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=worm+zone+io+mod+apk+god+modePDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/26565330651.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_off0000d419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD419 10568 bytes
SHA-256: d68112a3e0e086aa2f9b9a8ced62fec5c44713492f91bbe7bc862f7bf28b910d
font_01_sfnt_off0000ebf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 17436 bytes
SHA-256: 3cdaa440a49c97d407c9de54cd6dfd08360dc0d55dfc96745fa4276d767542bd
font_02_sfnt_off00011934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1