Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b67bf2376416df6…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 22:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8838b960df954158b22f3d4e27e013c8 SHA-1: 51a511eda97f92c661ccc4deedb9307f98b30082 SHA-256: 3b67bf2376416df6d58f72d78aa8a67bed8ec8166ca5ebc0a9d56345462ef484
222 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many of which are associated with link farms and disposable hosting. Heuristics indicate lures for browser extension installation and payment redirection, suggesting a social engineering attack. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick the user into downloading a second-stage payload or visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://warmistore.com/userfiles/file/pikubetilabug.pdf In PDF document text
    • http://rasmesafar.net/basefile/basefiles/64204362197.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/14359427343.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/wawifoguvutapafexok.pdfIn PDF document text
    • https://purefeeling8.com/data/file/fapevodizuxoderizodowoz.pdfIn PDF document text
    • http://dkind.net/userData/board/file/zamivosimotupadoxaxop.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/8777654714.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/palovi.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/616df6a6ddb0e4c3a9dc8e9891e0ddf7/nexowos.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/22653703738.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/36175521956.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/vigoxetamotosur.pdfIn PDF document text
    • https://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/85087740797.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/suxinexedirenozufamixa.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/dumigekugulelevi.pdfIn PDF document text
    • http://splogservice.ru/content/file/73809286660.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/webetijasedixum.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/wipel.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/tutid.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/galetokagizagop.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/mujalajaxan.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/38579734489.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/xupagisatogomesume.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/f1ec4e63475aca5384781129c1d58437/ripodojapov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=figma+ui+libraryPDF link annotation
    • 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_off0000d3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D7 10160 bytes
SHA-256: df519536aba6baee921076ceafd0443c5ee2c9c43160146bc8d946272e7ab605
font_01_sfnt_off0000ea80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10292 19824 bytes
SHA-256: a94173c52dcfd382ee4763e967edd798cfc7bc44083548f152bbcd935b0fab06

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