Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa84097de246a3c…

MALICIOUS

PDF

82.2 KB Created: 2021-10-04 21:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b9271345764836e69fdaa67b101b12ca SHA-1: c9bbbc2ccd07cab7e9b3cddebb8170fef5add6c1 SHA-256: 5fa84097de246a3c23e1224fd9ac4b2dde8173b5a615c821cf55ded0ce8afad8
106 Risk Score

Malware Insights

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

The sample is a PDF document that employs a social engineering lure, instructing the user to install a browser extension or update. This is a common tactic to trick users into executing malicious code or downloading further payloads. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely related to credential theft or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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=copy+and+paste+on+computer+keyboard PDF link annotation
    • http://dailymaydemtien.com/userfiles/files/gukidosejujel.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/14354711190.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/37788321470.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210908_449EA726D11753A3.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/dokawokatirajajum.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/ketefibadunolaxo.pdfIn PDF document text
    • https://podimercrm.com/img/files/vogaxarovurowetevat.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/24099839235.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/57645896670.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/gonozegozovexorepa.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/18022747852.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/40464813287.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/kavutotawofek.pdfIn PDF document text
    • http://superbarter.sk/media/file/fisitasixakefutikow.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/78527440881.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/19461597244.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/73270841837.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/uuoghhrahli1hskna4te5t2s7m/97063379407.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210913014802.pdfIn PDF document text
    • http://irollee.com/userfiles/file/nivajuwewuwirewoguxula.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210929_796717D0F13502CF.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148a6b0113d4---86485523083.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/tinesafurosagolu.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_off0000d8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C1 11016 bytes
SHA-256: a576e53cbaaee2a89b805a742cc9fb6b1628e856eebe854692a788f988dbc245
font_01_sfnt_off0000f238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF238 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4A 18608 bytes
SHA-256: 563a6e4669b4ca4afdaf5c9b48daa2eb73648b7aab7d9fa095373649d622766c

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