Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a359d036ee097a…

MALICIOUS

PDF

68.2 KB Created: 2021-09-25 12:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 02192511473353b02295f43c489f00ec SHA-1: 37f0e97493095413eab5a7a10ff2bd9aeda88a6a SHA-256: 37a359d036ee097abd43ff0fd06f5b65c6b5b0b977e090cb131cc7429308d118
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or scam attempt by presenting a large number of links on disposable hosting. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=faster+%26+safer+internet PDF link annotation
    • http://mvdeastudio.it/userfiles/files/vijavitejunozuri.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/27399044026.pdfIn PDF document text
    • http://trieuduong.com/images/Download/95743677822.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/6tt869n6lgosckk8r43hf1lfkn/gusorokazevigamofov.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/36209719737.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/46245136423.pdfIn PDF document text
    • https://farsiherbal.com/cache/fck_files/file/pojujeditadezubefipixi.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/zowuj.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/mejexolusipabikipeke.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/suratuxajumive.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/bimonosazidigexujan.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/mafifozomekorekudutozu.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/96796918295.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/lanewin.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/67353738246.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/70918586338.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/jukipudakaw.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/15230263983.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1dad0cbb2---momibuvererinu.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/5508107819.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/16264329786.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/fakajop.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/97870872373.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/99134960552.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/32757265815.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_off0000b044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC856 15300 bytes
SHA-256: 6e86f6fa9d5f98aa18e208f8363f8f85754a8346e6eec80bd3e2446e1009464c
font_02_sfnt_off0000ee69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE69 9708 bytes
SHA-256: 7676f2cc25fff0d6a7c97573ddbe7923f792a0ae843fab016e0bd8ae7ed50958