Malicious PDF — malware analysis report

Static analysis result for SHA-256 d938cae2dc8f1cd1…

MALICIOUS

PDF

82.9 KB Created: 2021-09-12 02:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1ead769772cc0851df2e1d90fa317467 SHA-1: 414ee6f4f178c2cef4b4b2a9d0667fa6e5445250 SHA-256: d938cae2dc8f1cd116495019c20f13d003d4547bd202c800985a47bc3b7de52d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution tactic. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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.
  • 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://rizecanreklam.com/images/file/vusurodivo.pdf In PDF document text
    • https://presstone.hu/userfiles/file/119597869.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/boxaxaremes.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/63568880591.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/d9c464bdbfd7ede3272954345bc2ac04/71133043526.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/remufifudojifidexatamub.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/kalemedobuvufuro.pdfIn PDF document text
    • https://redac.ch/upload/pisika.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/61165415567.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/37d191454d03871aecd74d906e364a3d/gumodafejutopi.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/67173368910.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/98042930817.pdfIn PDF document text
    • http://marine-inox.com/i/File/kejuxe.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/2245568845.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/ruwemilinibuduzazinaruvod.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/fosevafevebilatisitamida.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/40411287058.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/8271896735.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/86616835136.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/32873209999.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/8338934723.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/20274628465.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/98332552105.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/fadazufeduwalerix.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/xusilagubenoxexo.pdfIn PDF document text
    • http://svx.su/ffile/file/gozunizowizulakerakikaten.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=fahmi+virtual+apk+free+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_off0000d741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD741 20172 bytes
SHA-256: 4b3776fd59f116ef62d2202e0441dfa77cff8764849f1c2d8732ea1894753ce4
font_01_sfnt_off00010cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E8 10916 bytes
SHA-256: d637786a3c0860346090266a9ba11da6aba7d7faac3499ab56301692be41a0f5