Malicious PDF — malware analysis report

Static analysis result for SHA-256 2821812697d96289…

MALICIOUS

PDF

68.5 KB Created: 2021-09-28 14:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0bf28e439f1af00d071aaade0b644bb5 SHA-1: f6f6bdb59442f87ea2f00edf7391e203f9cad3d5 SHA-256: 2821812697d96289e15f867d7a60238d2e73d9a3a4765d1dcce0027290eb979e
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. A heuristic indicates a browser extension installation lure, suggesting the document's purpose is to trick users into downloading and executing malicious code. The embedded JavaScript likely facilitates this by initiating the download or exploit process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://associazionedynamica.it/uploads/file/52694263191.pdf In PDF document text
    • http://canadanur.com/resimler/files/91225292670.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/50662166795.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/tunifu.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/lomoxinaxifovuzuziwegowe.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/62502008588.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/88320679135.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/37008991450.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/46953741143.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/15032445335.pdfIn PDF document text
    • http://xfswchem.com/upload/files/26942261323.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/limokerijegovajiwu.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/13841991631.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/kinoxinodanodamawudabug.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/xoluzoxodigofafanadevit.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/48413385392.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614484c0a28eb---98227720947.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/gidemada.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153016556134---ruxuralex.pdfIn PDF document text
    • https://megashina24.ru/files/files/99808031538.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/38496387458.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/16697994049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=web+application+frameworkPDF 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_off0000adb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CB 10784 bytes
SHA-256: 9a311b16874eb44320e99af627c475907daeb16e4795382b2045c4787f907785
font_02_sfnt_off0000de73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE73 15408 bytes
SHA-256: 3ea77ac1932a70a1506a3ab6a0ed9d25b12020a0f2c53e51e5fc38ed32d66ec6