Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf43ae497f0f34bc…

MALICIOUS

PDF

80.3 KB Created: 2021-10-07 04:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 83fa3f1d7205d15b77c91e6f43707e6b SHA-1: 2ffb51926ffe706144878eb8f67b7056828f2198 SHA-256: cf43ae497f0f34bc350bb2f72dee7b1d8d25df7ad690998c5483cee8d81bb5db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://archism.ru/uplcv?utm_term=left+side+of+jaw+hurts PDF link annotation
    • https://zhbiotech.com/CKEdit/upload/files/96631386043.pdfIn PDF document text
    • https://dulichduyendangvietnam.com/uploads/news_file/38438787545.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/67552966637.pdfIn PDF document text
    • http://slsnn.ru/content/files/fajezuzomubag.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/fanegimafupoxavusevaj.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/31891152032.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20211042326169721.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/95900825182.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/mufigewoxodunuw.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/76194884890.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/letuxeligemurad.pdfIn PDF document text
    • http://faradbox.pl/files/file/nupigitejuno.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/93645943739.pdfIn PDF document text
    • http://garderoba.sk/images/_file/3290112136.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/fawepojifegixozuza.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/jefaxolilubinugifo.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/15191056179.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/31016083575.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/38822120773.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/54249154477.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139814550554---15381995114.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/tokodubetaru.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/65l5defp7c3l8pdqpsl4ni5k2e/riwasawuxurakebibod.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/52721292049.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_off0000d8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A3 16812 bytes
SHA-256: 4d03c4be5b5f94e7f51a8144eb5db3816df76ce87e32cfbd1b8428cfff03f974
font_01_sfnt_off00010376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10376 10576 bytes
SHA-256: 882d6da08f17596f0fa9a044951246e2bef94dcac9f8362b13227491c9de625f
font_02_sfnt_off00011bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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