Malicious PDF — malware analysis report

Static analysis result for SHA-256 597f3b8be4ea174b…

MALICIOUS

PDF

78.3 KB Created: 2021-04-16 04:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e796335cde67369e1df1101ab2b52edb SHA-1: cf924b8b81bbd85e7f85cb340509a284fc36e023 SHA-256: 597f3b8be4ea174b7b3d221ad3de9872b84a6bf5207d8a2efc5d7676f12166f1
174 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The presence of a 'Payment redirection / bank-detail change lure' heuristic, combined with embedded URLs pointing to potentially malicious domains, strongly suggests a phishing or financial fraud attempt. The document body, though heavily corrupted, contains fragments related to trading gold online, which could be part of the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://kuzutuzo.ru/strik?utm_term=how+to+trade+gold+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479446/normal_606c0e521b1d9.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimanujage/eheheau/mifomedanew.pdfIn PDF document text
    • https://cdn.sqhk.co/bikakigiben/jhhfCgf/deduzefefotipimikopizex.pdfIn PDF document text
    • https://cdn.sqhk.co/xelibini/aihDpha/pagarefenivepejilixor.pdfIn PDF document text
    • https://cdn.sqhk.co/tireronerogo/ieicpha/crystal_reports_13._0._35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388428/normal_5fec921b8c887.pdfIn PDF document text
    • https://cdn.sqhk.co/vepanoxubere/6igG9gi/month_calendar_template_september_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449177/normal_6019f737b6dc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460983/normal_6057b01c526a1.pdfIn PDF document text
    • https://cdn.sqhk.co/redusebi/Rhhgdgd/share_microsoft_to_do_list_outlook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464995/normal_60127fb2f1b1a.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/gre_analytical_writing_sample.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bf05558-7bfc-4f3e-9d9b-4ec0afd5cba7/mosap.pdfIn PDF document text
    • http://poborunedajemo.onlinewebshop.net/bedtime_bible_stories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/142c34d0-d334-4202-8395-4a105c93b06f/gurufutawuguw.pdfIn PDF document text
    • http://sugekix.rf.gd/icomania_answers_level_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8182953-29a7-4c2a-86c8-02c3d2da7671/bissell_powerforce_compact_bagless_vacuum_21129.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5e50d42-4dcc-41fc-a6e8-dace8f2fa714/counseling_the_culturally_diverse_theory_and_practice_eighth_edition_8th_edition.pdfIn PDF document text
    • http://debefataxa.rf.gd/rawutakixusajatonuxup.pdfIn PDF document text
    • http://fepetixapokurob.myartsonline.com/54413015030.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_off0000f6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B4 4868 bytes
SHA-256: 02d51ae5cdf0bb174815398b1b04535c2b6368bde5376dd0efd70aa6ba34e260
font_01_sfnt_off0001075f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075F 10636 bytes
SHA-256: 988b06d2819ae071133e139c159aeea19ddb657957ae1732d086cafb7ba65621

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