Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e2a48ffe45910a…

MALICIOUS

PDF

156.3 KB Created: 2021-09-14 08:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8f375da0a584cfec3013f36f05ca152e SHA-1: 1ef3726d2504c1986e903cc8f4408817b2b33f33 SHA-256: d3e2a48ffe45910a2d04e29ace94f4796d06baf5e7905beed0e75b17b2e51402
174 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and multiple external URIs, indicating a malicious intent to lure the user into installing a browser extension or update. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded JavaScript likely facilitates the execution of further malicious actions, such as downloading and executing a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • 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.
  • 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://www.nstoplana.rs/ckfinder/userfiles/files/77154287476.pdf In PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcc3d52ce0---77280830778.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/90615917064.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/21710007693.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-8/20210908191449991996.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/nojowetowidebokuxi.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328ed273bc9---tolabigem.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/rebenafunisirapo.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/xivipogudoviwerigozemo.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/83825134000.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/xutopawibopomuvele.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/19200826153.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/xalezikijoxaretorikurogeg.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/xariforasitafiwirawiwerut.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/3878702047.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/54637780438.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/sevibuwurawovorulaxi.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/66878887594.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/tivibodekejarigaparu.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/91574612099.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/pozisiwipovesegi.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/fatenaxed.pdfIn PDF document text
    • http://119pump.net/d/files/80956846504.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/83905852646.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/xaguwubofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=minecraft+classic+unblocked+wtfPDF 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_off0001f82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F82E 10880 bytes
SHA-256: 4e5a028a11fc0e15ffbf820986084990ee054d9380a582a5f3de34d23be9e435
font_01_sfnt_off00021185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21185 21696 bytes
SHA-256: 328d2f756b467be6017c16e21b89fe976a12ec0f1e127ef61c0febdbf8449d26
font_02_sfnt_off00024aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24AEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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