Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee5f3addabae6542…

MALICIOUS

PDF

81.2 KB Created: 2021-03-31 04:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 117c42bd790bad962c92b4c67b7200bc SHA-1: 26fa285d91ff78a44c71d13d42cc003ab429e250 SHA-256: ee5f3addabae6542c96c561f7e6959a858a88e72d042330338bae9723e0c43be
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicative of a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites, often involving JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=vaporesso+renova+zero+review PDF link annotation
    • https://cdn.sqhk.co/busoleva/RgiAYji/sofolidikoviwep.pdfIn PDF document text
    • https://cdn.sqhk.co/feziwetesene/aeDNTjd/30707002324.pdfIn PDF document text
    • http://ecoterritory.store/school_mark_sheet_in_excel_formatl0ptr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382197/normal_6060d89054b1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450244/normal_5fe975e48ca31.pdfIn PDF document text
    • http://ig-soft-team.com/26847819506lil0u.pdfIn PDF document text
    • http://arthromedro.xyz/xiluwubep32ow.pdfIn PDF document text
    • https://cdn.sqhk.co/fumodolanes/Stgchb3/top_speed_formula_ramp_car_stunts_game.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/formal_dresses_trends_2019kg00l.pdfIn PDF document text
    • http://dsv-trening.ru/96121424542jdzdj.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/Pjhfaia/celestia_ludenberg_cosplay_costume.pdfIn PDF document text
    • https://cdn.sqhk.co/pododefakes/bgihdjd/best_c64_emulator_for_mac_os.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460042/normal_6023d861430a4.pdfIn PDF document text
    • http://refoxipixob.iblogger.org/rarunibagiwevigale.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vijoputu.rf.gd/40501642042.pdfIn PDF document text
    • http://warodisomadux.epizy.com/debutuwumir.pdfIn PDF document text
    • http://nabesazuxipuf.epizy.com/feredudozidoxe.pdfIn PDF document text
    • http://lidazadopedu.rf.gd/gofawovolesabalusuvif.pdfIn PDF document text
    • http://darelarara.epizy.com/meiosis_worksheet_vocabulary_key.pdfIn PDF document text
    • http://jajopotisariko.epizy.com/dixomakilu.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_off0000f21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 4948 bytes
SHA-256: 5509d117a9eb24ed2a4907471af5015c45fc37092c27cdf8314c28182f51c527
font_01_sfnt_off0001031b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031B 16368 bytes
SHA-256: 2b3a9143ec7b838463f871746f90f2631adf1a8de6c29348db51196e0df3e7f9

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