Malicious PDF — malware analysis report

Static analysis result for SHA-256 410f6c9e3657fbac…

MALICIOUS

PDF

86.0 KB Created: 2021-09-16 11:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 828da2196ffe53a652f81220fe186ceb SHA-1: b6624a9b66fbf02b70d6b7e1f37dc3ab2006c3cd SHA-256: 410f6c9e3657fbac34617166e3449ccece3c4d39f18a4175f1b1b43e6b786e96
186 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and employs a social engineering lure to trick users into installing a browser extension or plugin. The document contains numerous embedded URLs, many pointing to disposable hosting, suggesting an attempt to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://oniceh.ru/uplcv?utm_term=best+car+modification+games+for+android PDF link annotation
    • http://galedo.cz/www/data/cms_files/files/41252886491.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/38095594249.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/dukijokepetofoferuv.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/72879884967.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/vudamawobarupifudexuwuvup.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210913/file/1631496827.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/6bk0bi44n36qda9f8vfpkptlds/puxemajaxojizop.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33888066727.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/pixudakerumefuxejoxufa.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/lutumabipexu.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/71123919690.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/94412481662.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/68928378228.pdfIn PDF document text
    • https://kingcom.edesign.fr/gr33/web/uploads/assets/file/dejewiganijipuvur.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/73881452477.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/zudibosesexodew.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/famogijudisok.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/fodawuzekuwasaf.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/pefesopixadapebonumuva.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/zudonaxugumiwaxisufen.pdfIn PDF document text
    • https://sergiomauri.com/images/file/dilubikebadalum.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161422d7666db5---5226125539.pdfIn PDF document text
    • http://186086.com/upload/files/12562165253.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/liboseremejokejefafina.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_off0000eb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB45 10828 bytes
SHA-256: e8ac8683da4bf5acc320e120622a46f2e7146a12a50283addec2a24b481187f6
font_01_sfnt_off00010414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10414 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C26 17576 bytes
SHA-256: b741f45321583234344cb8d87afda1ba93f1e81e8f8f5a47f724bf4faff69155