Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c88219950aac8d…

MALICIOUS

PDF

67.7 KB Created: 2021-09-30 21:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0dd6b8ec4dc14828b5977ebeba38de5a SHA-1: 066f71832531a60f97f2fa19633916b5b25b88e8 SHA-256: 98c88219950aac8d302b5b8f58e2621f7299d91c0289b96faf3bc33ad940f6f4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to trick users into downloading further malicious content or visiting phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://queure.ru/uplcv?utm_term=remix+os+tablet
    • https://arhiapp.web-idea.ro/app/webroot/files/userfiles/files/piriwoxebexigex.pdf
    • http://cariboohose.com/userfiles/file/85824184390.pdf
    • http://wsm.hk/images/uploadfiles/file/24714234080.pdf
    • http://sswjeans.com/files/25069402309.pdf
    • https://siroyensao.com/upload/files/23102461044.pdf
    • http://wienbildarchiv.com/upload_files/files/89215708797.pdf
    • https://linkevicius.com/upload/galery/file/25613153678.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16155e679c1a8d---vanokodel.pdf
    • https://specializedfacilitymgt.com/public_html/userfiles/file/nunekagul.pdf
    • https://caraudioshop.ro/mm/file/11067059415.pdf
    • https://expomediainc.com/upload/file/xopadototamawujofegum.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/34164675582.pdf
    • http://arqing.es/ckfinder/userfiles/files/54160292253.pdf
    • https://granitabrasive.com/editor_up/bejalagu.pdf
    • http://gucaoyun.com/uploads/file/200256275472.pdf
    • https://techlan.pl/files/file/sarurerudasexekolufepirin.pdf
    • https://needlugs.com/userfiles/files/37609814757.pdf
    • https://alistairmills.com/ckfinder/userfiles/files/55845188711.pdf
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/76681801477.pdf
    • https://quangtriasianwindow.com/uploads/image/files/13191736310.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/f8109dd0da9e2929cb8c4b5fcc3f097f/defubomededurizaku.pdf
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/jokubi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aca9.bin
4d5703416b9602b17591140a74f28e2e0a78b1c3825acbf2c492707673beed1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACA9 15064 bytes
font_01_sfnt_off0000d27d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD27D 16792 bytes
font_02_sfnt_off0000ea94.bin
01bb22fc6a61e6fe56d437e9c0c52dc376130759d1863f6ba0702b536bd56f79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA94 10352 bytes

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