Malicious PDF — malware analysis report

Static analysis result for SHA-256 95fb26fb1f1ef4d9…

MALICIOUS

PDF

83.5 KB Created: 2021-09-21 10:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54645b8007c4a0719846053ed81e171f SHA-1: 0ba0be1292bb0807add0a3622e32594d7ec09434 SHA-256: 95fb26fb1f1ef4d9d625d69f5a295d5ba4b3516460a04945b0efed5947da9c14
166 Risk Score

Malware Insights

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

The PDF document contains numerous external links and is flagged by heuristics as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing malicious software disguised as a browser update or extension. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. While no scripts were directly extracted, the nature of the lures and the embedded URLs strongly suggest an intent to download and execute a second-stage payload, likely involving JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=dark+mode+safari+extension
    • https://larustt.com/upload/ckfinder/files/8464969909.pdf
    • http://kolaykanal.com/userfiles/files/xanigerotegigali.pdf
    • http://marjoleintje.nl/include/userfiles/pubuse.pdf
    • https://ipmgrouphr.com/uploads/news_file/3722610670.pdf
    • https://verticala.ro/images/userfiles/jexamanoma.pdf
    • http://www.kickcommerce.com/userfiles/file/6884557665.pdf
    • http://cyclad.org/UserFiles/file/mufijowepukuwadebirukut.pdf
    • http://rickgrisolia.com/userfiles/files/93654617730.pdf
    • http://ingfrimale.com/userfiles/files/48914123987.pdf
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/ruwomalimumafavax.pdf
    • http://www.bongbansaigon.com/uploads/files/sokemajiruxodezekedodesiv.pdf
    • http://taiwanglassgroup.cn/userfiles/file/jeriworuk.pdf
    • http://ahnil.com/userData/board/file/34294953735.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a15d609971---mavalapigasoxodo.pdf
    • http://copingconversations.com/userfiles/file/84804552151.pdf
    • https://daiichitravel.com/uploads/news_file/nimuwovatumefegisuv.pdf
    • https://cam-ceeds.org/ckfinder/userfiles/files/kozagiwurowuwas.pdf
    • http://climacom.eu/userfiles/files/mukunudodet.pdf
    • http://jedzenie365.pl/ckfinder/userfiles/files/91479151217.pdf
    • https://amthanhanhsangchinhhang.vn/upload/files/94375241366.pdf
    • https://ambient-interier.cz/files/files/19764122429.pdf
    • https://taucaotoccatba.vn/images/news/files/33315059716.pdf
    • https://un7un9b3rl1pa7-99.com/contents/files/fibofojedozu.pdf
    • https://artcorner-fiberglass.com/userfiles/files/zumil.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_off0000de90.bin
cd5408f9d57da85db2346c795ca235ef264b765a1800a4155973465ee3b1fc85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 18944 bytes
font_01_sfnt_off00010fc4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC4 16792 bytes
font_02_sfnt_off000127db.bin
4cb744e279e0e2b3473464042028b933215b440116c94b0001a7e5d3ba9adb44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127DB 10664 bytes

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