Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61f213aca024b2a…

MALICIOUS

PDF

83.9 KB Created: 2021-09-18 16:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebe33ae671ade0fa38f4bef9715afecc SHA-1: dbf371bafb3a214066ce38e53dd7b13fd0e5bbdf SHA-256: a61f213aca024b2a7d6dbb03e2790fae4d912f50d22b5f82905278a04dc15185
166 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing malicious software by pretending to be a required browser update or extension. Numerous external URLs were found, indicating a potential download or redirection mechanism, likely involving JavaScript execution within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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://cructi.ru/uplcv?utm_term=how+to+take+a+screenshot+on+my+android
    • https://mollis.rs/files/bolajetanalofejibuseg.pdf
    • http://cheniou.handysociality.com/upload/files/varulevejawipizemuje.pdf
    • https://bonekarusa.com/contents/files/79070258083.pdf
    • http://rvhifi.cz/files/file/sujawawubemirepaselefu.pdf
    • http://janjoling.com/public/ckfinder/userfiles/files/32213649378.pdf
    • http://lsbwg.com/ckfinder/userfiles/files/20210914/054943237.pdf
    • https://shih-tzu.ro/files/file/537242554.pdf
    • https://hattshopping.com/admin/assets/images/ckfiles/17738701844.pdf
    • https://fisheaglesafaris.net/pics/user/file/88454471806.pdf
    • http://mirai-kankyo.com/userfiles/files/60726920849.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e2232b1fa---42838967488.pdf
    • http://aqs-group.it/userfiles/files/65090957135.pdf
    • http://luxcottage.ru/stroykamen/userfiles/files/13160050225.pdf
    • http://home-plast.ru/foto/files/newokosiluwo.pdf
    • http://thaicockstar.com/ckfinder/userfiles/files/60663217557.pdf
    • http://we-women.de/default/files/uploads/file/xibevumalojebapugiruw.pdf
    • https://serrechevalier-skifun.com/imagesfile/xuzat.pdf
    • https://leosservices.com/userfiles/file/9195767382.pdf
    • http://bosch-elektronarzedzia.pl/catalog/file/6000057605.pdf
    • https://mercerapparelss.com/userfiles/files/lugatevoxer.pdf
    • http://www.huescalamagiaenfotos.com/userfiles/files/59854312368.pdf
    • https://ozmutludokum.com/userfiles/file/zeripunifivuvakomasas.pdf
    • http://ac-kenigsberg.ru/files/file/fafadapokekuvo.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b2665c472---zubogor.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_off0000df80.bin
8d1d72074affd854fe36a761c5c36f6ed43646431194a8b3d0d409fc7cd5d4c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF80 19136 bytes
font_01_sfnt_off00011115.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11115 16792 bytes
font_02_sfnt_off0001292c.bin
284d610401d40cb2c77f75f8e79f6bee7a6a871c40872d6076efd1dae09fbdaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1292C 10872 bytes

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