Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd9a2c094a82d99e…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 22:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7038478a3a38cb2efadaad7fa376abab SHA-1: 2971963c19e2adf6e1ade7846d545371ac9dc1c6 SHA-256: dd9a2c094a82d99efd94be95c540c16efa31d618a4514e385e3d62bcdde096f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the presence of external URIs and the overall detection profile point towards an attack pattern involving luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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 http://5thaveseniors.org/userfiles/file/refanos.pdf In PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/21502261722.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/gafufevafovapu.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/15071830315.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/raravune.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/kulubelulivijaboluxaf.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/zadaw.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/nobubuzetigukoguwazegafi.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/zuvoluzidofodakokal.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/wolojov.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/tirutesu.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/zowenujasuxevawo.pdfIn PDF document text
    • http://twilaw.com/files/files/61284791525.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/kasowewumabusasapuwuwejo.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/mojunesivutus.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/82336294005.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/51670447910.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/95852379433.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/19760038852.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/e1227901a16ff24fd3bbc46351aed680/62308722277.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161339b6d8808b---jodivunutipevup.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/kuwaxafojazobofemiwisitu.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/34242842977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=x431+idiag+app+downloadPDF 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_off0000d592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD592 10464 bytes
SHA-256: 8c83c1350b76eee45215294a920537ee67ba4cc85caea55fc7686215849951e0
font_01_sfnt_off0000ed45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10557 17240 bytes
SHA-256: dd6f50d5e1a162e62be405144f7bf36e22feff8e1f21e42feb1baac719422b81