Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff19c63830a1e6a…

MALICIOUS

PDF

77.1 KB Created: 2021-09-08 17:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86255f68d50d6bb6be7b957aaff68170 SHA-1: a55ed6d9e3d57462bbc60518637aeb2ebf7a7aeb SHA-256: 5ff19c63830a1e6a489c7dd5173afca433871f1cef97e6169e20fd4febc3a91d
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and external URIs, indicating malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document is designed to trick users into installing a fake browser extension or update, a common method for malware delivery or credential theft. The ML classifier and ClamAV detection further confirm its malicious nature, with the embedded JavaScript likely facilitating the download and execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://chcial.ru/uplcv?utm_term=sms+alerts+manual
    • http://urdu-hadith.com/survey/userfiles/files/12836092403.pdf
    • http://cabinet-blin.fr/ressource/site-image/files/3694921146.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161349cd87942d---59748611832.pdf
    • http://youandisagenix.com/ckfinder/userfiles/files/87726941121.pdf
    • https://vanphongphampmc.com/upload/files/48948930396.pdf
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/68982690107.pdf
    • https://ambient-interier.cz/files/files/75482131957.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325f4f082b7---kokuminotumakanifowolu.pdf
    • http://visit-pune.com/userfiles/file/13010750846.pdf
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87685906850.pdf
    • http://www.prctech-th.com/ckfinder/userfiles/files/48622464641.pdf
    • http://berbun.com/user_img/file/jetetakimumomotoveruvat.pdf
    • http://studioguagnoni.it/userfiles/files/28778640669.pdf
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/48278340277.pdf
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lakare.pdf
    • http://world-green-hope.com/uploads/files/72612738620.pdf
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/zinitozofowisujelofabe.pdf
    • https://euro-m.si/web/dokumenti/file/bewanep.pdf
    • http://kqcme.yiaiwang.com.cn/upload/files/zabuvotuputibepojejer.pdf
    • https://immsac.pe/sgi_userfiles/userfiles/files/vawisu.pdf
    • https://proia.bg/userfiles/file/vunolo.pdf
    • http://goteneplast.se/files/images/file/lexeleserobuniwalukesovo.pdf
    • http://erex.hu/upload/file/57206560243.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_off0000ca9b.bin
d3c63d5ed831d799272a8225eb393f204a20e4a293f259da1b9a731c42dc6416		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9B 17640 bytes
font_01_sfnt_off0000f80c.bin
355227a1aad3415a1e8c082ff59c5c8acec9c5ccfe2b34beea0f9edc926c7b94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF80C 10232 bytes
font_02_sfnt_off00010f03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F03 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.