Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b87bd08695d10d7…

MALICIOUS

PDF

79.3 KB Created: 2021-09-18 02:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 16b0f8e2807eed9b6f355d98c271b30c SHA-1: 636d5f1a755108704bf4b7df04a555ae9f7e7098 SHA-256: 9b87bd08695d10d76e29130d9ea2920932890ee21f2d37a8cc8b6e0757163d0a
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to potential exploitation or redirection mechanisms within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/likipejonelapuzi.pdf In PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/oe0006sav5su82vmkk4d45abni/80298169152.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/561902676.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/22021843477.pdfIn PDF document text
    • http://zaiger.ru/img/file/rukewigituzebigebapi.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/72904530395.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/12290678410.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210913_5D81E847C2A5816C.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210905_DB0F31110028938E.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/46684553249.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/gadonadix.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/62976103330.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/mefujapidokiku.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210906_B154E0960BA353E7.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/6137149c78c15.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/barixopiwubojejemi.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/pezukafi.pdfIn PDF document text
    • http://erdbau-rauch.at/29620676840.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/duwoxejokanoma.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/wolupabuzunodofarebike.pdfIn PDF document text
    • http://newcityhk.com/userfiles/28535171890.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/57967087211.pdfIn PDF document text
    • http://videlec.be/ressource/file/14717100317.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/negiwe.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140b034ad5a6---kowikugono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=personality+theories+book+pdfPDF link annotation
    • 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_off0000d276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8D 10940 bytes
SHA-256: 07cc4f9a0dc8ac068e1b29c07fdbbf49322653290566b77395c6fecfe73e85b6
font_02_sfnt_off000103a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A4 17136 bytes
SHA-256: b3042e8f68792bf13acf6f5770ff630f9ddcce8edf053bae60d3ca3a7682ea8c

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