Malicious PDF — malware analysis report

Static analysis result for SHA-256 f459093fc336c0fc…

MALICIOUS

PDF

83.7 KB Created: 2021-03-13 18:08:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 38c538fd495c2fdf045d0c1211cd5043 SHA-1: 18039cdc57f95a2d3159a15d7c001a9b3cc278de SHA-256: f459093fc336c0fcb3b7160deef9d88f0df074950cdb0154c778d836b577d917
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://lozipotod.ru/award?keyword=ccna+security+study+guide+exam+210+260+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379846/normal_600bf7cf7e9f9.pdfIn PDF document text
    • http://malanefire.sportsontheweb.net/gonatitibiguka.pdfIn PDF document text
    • https://bozuwosumexoxal.weebly.com/uploads/1/3/2/6/132682772/336786.pdfIn PDF document text
    • https://cdn.sqhk.co/pibusupi/hbahcic/adventure_quest_dragons_mod_apk.pdfIn PDF document text
    • https://pebawozo.weebly.com/uploads/1/3/4/8/134865175/gadinufovik_favarujuxid_tufijuverowew.pdfIn PDF document text
    • https://vedakevuvapi.weebly.com/uploads/1/3/4/0/134013486/xabipolo.pdfIn PDF document text
    • https://cdn.sqhk.co/xafiguzi/jjfxhcG/mild_steel_square_hollow_pipe_weight_calculator.pdfIn PDF document text
    • https://weritudasokapo.weebly.com/uploads/1/3/4/4/134494226/2096212.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/fXsmvPG/bot_machine_learning_algorithms_from_scratch.pdfIn PDF document text
    • https://cdn.sqhk.co/vujaderaz/qghfggj/symantec_file_share_encryption_admin_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406202/normal_5fe5e6195bc37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486983/normal_5fcaa0e3bf078.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lejiletuvasipib.onlinewebshop.net/43936268896.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca2b8b5f-2dc5-47ce-8a40-0cacbf6b9e00/icewind_dale_enhanced_edition_multiplayer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83cfcb24-37e1-4b8e-bb6d-b14f7553bc19/warriors_into_the_wild_tv_show.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7e0ac98-ee84-4943-b252-f1f4a2864b2a/xujigobaxodalurun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e9c6f48-3cda-474f-8ead-93631c913029/all_my_sons_short_plot_summary.pdfIn PDF document text
    • http://fuluxewamotate.atwebpages.com/it_project_management_documentation_templates.pdfIn PDF document text
    • http://bupalim.atwebpages.com/67349003719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d91edfc5-78b6-482d-9212-e571dc619b04/liwivasifisemeruxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d32715c-52ef-430b-af92-321e630abfb0/volca_sample_pack_wordpress.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adf0f1ad-69c8-4b54-be37-88c6181de921/wovexepanurolufo.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_off0001058e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058E 6000 bytes
SHA-256: 9f58a4964bf106557e81bd8bc51387f25c12ecee5d62722dc579262d530625e5
font_01_sfnt_off000119f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F9 11936 bytes
SHA-256: 4392346b01040d670bb277f6dd7f6428914908a5a05eeb59fea2d5baaffa470f