Malicious PDF — malware analysis report

Static analysis result for SHA-256 4628b6e4091c7be7…

MALICIOUS

PDF

77.4 KB Created: 2021-03-30 16:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 521dfa2a26b5d3c3ab1b1bbc4349bfe2 SHA-1: 5e98a3d56a9219d7d1cca2c8bcfd5ba55f2170a3 SHA-256: 4628b6e4091c7be7e0585bdf751d3ceaf6d372727582715ff03b61819b5fbcd7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a malicious link farm designed for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to a harmful site.

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=acentuaci%25C3%25B3n+reglas+palabras+agudas+llanas+esdr%25C3%25BAjulas+y+sobresdr%25C3%25BAjulas PDF link annotation
    • https://cdn.sqhk.co/gabazumad/z3GLqic/91503550247.pdfIn PDF document text
    • http://favarorul.iblogger.org/classifying_animals_worksheet_3rd_grade.pdfIn PDF document text
    • https://cdn.sqhk.co/nudotunaza/sgdyWjb/dragon_impling_hunting_guide_osrs.pdfIn PDF document text
    • http://sajogol.iblogger.org/anomalia_del_atlantico_sur.pdfIn PDF document text
    • http://jinomikezed.iblogger.org/movies_wood_tamil_2018.pdfIn PDF document text
    • http://ruvuwibez.22web.org/difference_between_web_service_vs_web_api.pdfIn PDF document text
    • https://cdn.sqhk.co/nakijalufiw/iX80mp5/keto_shopping_list_walmart_printable.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://desojamoj.rf.gd/rekurutupowalevuvuxademun.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/biaxial_stress_testing_methods_for_sheet_metals.pdfIn PDF document text
    • https://0efdb04f-128a-4c0d-ace4-8b312723ebcc.filesusr.com/ugd/5508f4_1a97e28a37574a27ac50d99e7d36aef9.pdf?index=trueIn PDF document text
    • https://d7d9470a-9784-4c28-ac68-b1ab0f70ddf3.filesusr.com/ugd/148484_53fd80c19ed24545adc14efae15d9235.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/conflict_management_powerpoint_templates.pdfIn PDF document text
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_2df65ee82dc0439d8839df755737fb07.pdf?index=trueIn PDF document text
    • http://tedupogepovajeb.epizy.com/how_to_start_the_fireplace_gas.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/android_developer_options_demo_mode.pdfIn PDF document text
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_e0ca4445dabf479c9b530925ea0de595.pdf?index=trueIn PDF document text
    • http://biguwaximi.epizy.com/capture_one_pro_film_styles.pdfIn PDF document text
    • http://rofumuramim.epizy.com/muxokoporesutarubakarezuk.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/11704318942.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_off0000eae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE8 5800 bytes
SHA-256: c28f11bf9b95788df15426f88e8b0a8cce1e0110ffa2eb757836c5a7980d4d81
font_01_sfnt_off0000fe48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE48 12132 bytes
SHA-256: 1e31dd6642f255f51d21e149092c80e796555a78cece84a7053283be8c55c923

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