Malicious PDF — malware analysis report

Static analysis result for SHA-256 2decc3bfbc256419…

MALICIOUS

PDF

72.1 KB Created: 2021-09-29 08:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 72e4a5528138fcc47dc790106b417c53 SHA-1: 826f9cd154b010976bf7fdd0e8e34640377e95e3 SHA-256: 2decc3bfbc2564195f3684406ba583b63d6d615fc0751bd28a2d2970d7e3d669
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URLs, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support this assessment. The embedded JavaScript likely facilitates the redirection or further payload delivery, while the numerous URLs suggest a link farm or phishing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://chcial.ru/uplcv?utm_term=android+development+with+react+native PDF link annotation
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/xigapetefalubototowategem.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/dinolij.pdfIn PDF document text
    • http://contua.org/userfiles/file/difizawojanil.pdfIn PDF document text
    • http://peiitw.com/Upload/ckeditor/files/56338933652.pdfIn PDF document text
    • https://otomatcilarmetal.com/otomat/upload/files/rivuxamewiwebakig.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/73978151550.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/13634436460.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/66690892721.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/urlm1d662espee1t1g7pmg2iv0/mizarenuziba.pdfIn PDF document text
    • http://robbes.nl/media/files/fixovabuniwaxigivitawano.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210905013442.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/boduli.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/85893607787.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/bukilamonerugelipu.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/ronulipadoze.pdfIn PDF document text
    • https://priscar.com/documents/files/siruximigenalipigenimin.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/katuwiziresume.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/24361443293.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210909030510.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/nekixabudup.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/xuwuderulexikotapitef.pdfIn PDF document text
    • http://china-shengbang.com/upload_fck/file/2021-9-29/20210929092111752464.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_off0000b56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD84 10744 bytes
SHA-256: c30acc217e6334852e4ac325572ef4a49219ace7c88fd216eac62ba79881e5d3
font_02_sfnt_off0000e60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60F 16964 bytes
SHA-256: e15d3d1381663bffc723e8682cda5efc91ddee70f8ecf7bafcf81cf80dc1ed8a

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