Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b0189cdebf2a0e…

MALICIOUS

PDF

82.2 KB Created: 2021-09-10 11:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9a9252430bc666cefc9eec6ab95949d7 SHA-1: 7e1ad6c71456ef32e73325a91b3b0c71b358104f SHA-256: 21b0189cdebf2a0e1f57fb5152468fbd7539e80978b631053ccf562e854332c0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many hosted on disposable domains, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is a phishing or malware distribution lure. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=trece+martires+zip+code PDF link annotation
    • http://sage-chem.com/image/files/20210906_124412.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/79424753649.pdfIn PDF document text
    • https://togeltop.net/contents/files/busajezozikusexekoj.pdfIn PDF document text
    • https://istanajp.com/contents/files/79290852998.pdfIn PDF document text
    • https://subarini.ro/mm/file/25392302352.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/giwiderakozi.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/wedelob.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/sososarevenuninol.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/85339363395.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/9b0913787b4886fae27ddce69faf6d3a/wogezukokirapet.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/dumavigurusatekelem.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613700439df35---lakitexareje.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/25455608928.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/36563012029.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/fodaletazativ.pdfIn PDF document text
    • http://contelex.it/userfiles/files/pebupaxomiralopebiwerobu.pdfIn PDF document text
    • http://jonme.net/ckupload/files/genofozibirixepavulemutux.pdfIn PDF document text
    • http://precisao.net/files/files/satimusomelusefurubagubo.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/nenugakaxisi.pdfIn PDF document text
    • http://ucokampen.com/media/files/35201786193.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_off0000dcd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD5 10548 bytes
SHA-256: 817b4c141e0ad26ce3d7627de581f84c171bf877963cdc4695dedacc1e85d92b
font_01_sfnt_off0000f4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D05 17836 bytes
SHA-256: 4d84316388bb6d8235321e6002b478b2b871cbcbf506e2304ba4f33f02c29f3b

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