Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f921835c8b4ce2…

MALICIOUS

PDF

84.4 KB Created: 2021-03-23 11:00:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6775075392da0458e0c1bab457da7178 SHA-1: 23e6bf3e7c480a2cbe6714dcaa5ff39acc78895e SHA-256: b9f921835c8b4ce24234ecf8ec30812a299f544e2903d8602be83d32e031b808
96 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a phishing site. While no scripts were explicitly extracted, the nature of the detection and the embedded URI suggest an attempt to trick the user into visiting a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=secured+transactions+outline+bar+exam PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491936/normal_6056ed3aec308.pdfIn PDF document text
    • https://cdn.sqhk.co/wanevakaxuma/jaJJoij/91099634682.pdfIn PDF document text
    • https://cdn.sqhk.co/zolewiko/cheiekT/29895389805.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/ThgjfNJ/winner_soccer_evolution_mod_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/kobadaxo/jbiauge/23391171886.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460980/normal_6027e68f57ce7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383797/normal_5ff58753b8305.pdfIn PDF document text
    • https://cdn.sqhk.co/renosopezare/qidhhe7/tikobaxuk.pdfIn PDF document text
    • https://cdn.sqhk.co/madilaxetevo/YibFjf5/color_galaxy_live_wallpaper_water.pdfIn PDF document text
    • https://cdn.sqhk.co/fetumamuv/6CfVhga/carrom_rules_for_queen_and_last_coin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411250/normal_6033c28582386.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366024/normal_5ff2d21b4649a.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusetoteji/je5rHAS/barcode_scanner_online_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xasovewipeje/fanalixetuvo.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/mefurovafosalixefejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e2c0cdb-03df-412b-9c77-7ef1c5962967/what_is_the_sequence_of_steps_for_the_service_recovery_process.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/comparative_adjectives_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17c88e30-9134-4d06-a675-6d62b2d4f77c/1987_honda_shadow_1100_bobber_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/kizajixuxofowosuvajarera.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/snapper_snow_blower_spark_plug_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/59708371375.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e88a139-5e0c-48ff-84ed-4a71d3c7ecb4/el_pequeo_vampiro_en_peligro_libro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd20942f-48d5-4ec7-9d8f-5f7c9b656bcf/how_to_prepare_for_a_social_work_masters_interview.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/50987183101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef48fa1d-cdf2-48e2-ba89-143335d7c504/how_to_access_3d_library_in_paint_3d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1E 5280 bytes
SHA-256: e93cf61cca96e19c3506705615e80b89ac1387fa0b8f266fd551dd723608dba4
font_01_sfnt_off00010bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEC 11992 bytes
SHA-256: 2087d3bf89884459da58f70c7c2ecde03dffaf43688060b0b4c4448a89fbba8d
font_02_sfnt_off0001345e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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