Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6dcc90e0150e9ba…

MALICIOUS

PDF

74.4 KB Created: 2021-09-14 12:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cee9c2344c2348a299a277f2d3633020 SHA-1: 7b47fa5dd41a484c7d3a2319e93b18a3cce682ea SHA-256: b6dcc90e0150e9ba2e5008a0d888ea8274b40f3be5f01ca97031bbd16728b531
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The numerous external URLs, many pointing to PDF files on potentially disposable domains, suggest a link farm or phishing lure designed to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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.focus.mu/wp-content/plugins/super-forms/uploads/php/files/c463c675460db715482eeaa7a1493256/bexipejuzow.pdf In PDF document text
    • http://xpeedon.net/userfiles/file/20210908184946.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/82836994050.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/zujijixaxutifule.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/janifuzuger.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138df8775a2a---getoz.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/reroworivomuru.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/paxesig.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/11072464037.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/98513563363.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210903_173F6E2F961B32B9.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/57740375131.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/xibitelixetovozos.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/63130281986.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/83599636212.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/sagizipujexakup.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/tenigejewoxasumel.pdfIn PDF document text
    • http://dsagco.com/Upload/file/nesopobafivifew.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/luxapilarelu.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/44251599524.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/segonoso.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/12732067263.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/jijugafidaladizoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=best+audio+converter+app+for+androidPDF 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_off0000be26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE26 10784 bytes
SHA-256: 2e297a2d052560cd36d5d309ba74329b1a38473f37d2ff8ce8e2bc76ee2b26d8
font_01_sfnt_off0000d733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD733 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF45 17268 bytes
SHA-256: 94036936f2e1d5773cbdbd7b54ec0178bfd8e7e29686bf29818f9bbc861514a8