Malicious PDF — malware analysis report

Static analysis result for SHA-256 08ca9cd1fd5c302a…

MALICIOUS

PDF

72.0 KB Created: 2021-02-22 19:44:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 45c42de3974a13aa2b295124107b1bd5 SHA-1: 0530c87195a7c9616744060ea12d62c1e974d637 SHA-256: 08ca9cd1fd5c302a3bfdd92d527f535215badb348020ed10e22e614c80022c9a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded URLs, including one pointing to a known malicious domain ('jottigo.ru') and another to a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://jottigo.ru/strik?utm_term=how+to+do+exchange+rate+questions PDF link annotation
    • http://kadabafomelu.66ghz.com/blacksmithing_wow_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwuxa/jijjfja/download_game_world_chef_mod_offline.pdfIn PDF document text
    • https://cdn.sqhk.co/rotogogoji/PjfvihZ/tolabawukunogefokasevi.pdfIn PDF document text
    • http://nogivubuleduwi.22web.org/beauty_plus_hd_camera_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/lovuzegonu/ij1WTvI/samsung_galaxy_incoming_mail_server_settings.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mekebinaga.rf.gd/best_all-wheel_drive_lawn_mower_2020.pdfIn PDF document text
    • http://jujeludapivibiw.rf.gd/rexudififiwemovidunito.pdfIn PDF document text
    • http://dafiwogi.rf.gd/antivirus_software_free_android.pdfIn PDF document text
    • http://satonavuka.rf.gd/fijipemurorinojipi.pdfIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/gst_tax_slab_item_wise.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/55991654337.pdfIn PDF document text
    • http://gusalixofunek.epizy.com/88932746839.pdfIn PDF document text
    • http://larisakexifa.epizy.com/simple_label_body_parts_worksheet.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC76 5416 bytes
SHA-256: 1d78b9f8fec0c0141bcebb6459c7a0c42badcca1643700ef590a2a0de4ea4465
font_01_sfnt_off0000eee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE6 10624 bytes
SHA-256: 0333e9516c312a8d8b79ea660df5eb6c8e57435aa652de1f9332af96664bc031

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