Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf29f25ed5b779e1…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 10:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f16678db3ebe3eda8de109375a1d78a2 SHA-1: c328fb0ea2927886e9d037edd045dd82f8f0f466 SHA-256: bf29f25ed5b779e144070c4f0234feec77c3959be21e6bdee373be4d5c684379
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document is designed to redirect users to a variety of potentially malicious or phishing sites. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=tubemate+video+downloader+2020 PDF link annotation
    • http://autoscuolavalerio.it/userfiles/files/96261653867.pdfIn PDF document text
    • https://brs.jo/userfiles/files/34995777137.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/petularugiwikap.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/43d12232c2da9ff1cee1fd3a7f08a087/58120172330.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/61165415567.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/rifazoxi.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/dopigokuturunarifobuta.pdfIn PDF document text
    • https://windscrm.net/files/file/gexunelikonu.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/tugoxigimigemanotaxulude.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/kurigofidexivinebovomon.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/wazetumad.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/7245869374.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/40009428678.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/jisazezuxofudopelos.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/49779467932.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/64119535115.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/49388253159.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/89973400329.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/nesomumagesoxexigateluj.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/mamofawutotadato.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/f93bbfa5a3172d01d1549bc29d5163ae/37089429373.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_off0000d3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C7 18028 bytes
SHA-256: 19d68580832e931f169973a4c985cebcd6f978273f217d5c15acc06456987ed6
font_01_sfnt_off00010272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A89 10836 bytes
SHA-256: 7a1df6e766c4f779ee981c45c10cbbbfc9009822d8f1ce7d04a20a778a7dae91

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