Malicious PDF — malware analysis report

Static analysis result for SHA-256 3912bdccec80ece7…

MALICIOUS

PDF

82.1 KB Created: 2021-02-20 19:55:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 33567044b70a9303c9b93b105fd22b98 SHA-1: c884787fb667e0adc9ab91a619b2e1a07452c0db SHA-256: 3912bdccec80ece7c974fcf189cc82c7cbe0671e0b535ed7a79c82528b344aa8
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a malicious intent to distribute further payloads or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious content. The document body, though heavily obfuscated, contains a reference to 'how to day trade stocks on robinhood', which is likely a lure to disguise the malicious nature of the links.

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://crophysi.ru/123?utm_term=how+to+day+trade+stocks+on+robinhood PDF link annotation
    • http://gnatural.space/nusaxazunawuza83aqf.pdfIn PDF document text
    • https://cdn.sqhk.co/farafakilof/ja2WKw1/mexan.pdfIn PDF document text
    • http://mazanaposiwos.iblogger.org/tupuwokupizikutebu.pdfIn PDF document text
    • https://cdn.sqhk.co/satofapo/oMzhejf/66067411010.pdfIn PDF document text
    • http://afracheat1.xyz/descargar_musica_los_tucanes_de_tijuana_mix_corridos9pmos.pdfIn PDF document text
    • http://epaytds.xyz/treatment_of_bronchial_asthma7x5od.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvifilezaja/jjhizgj/20690568898.pdfIn PDF document text
    • http://cmbmarketing.agency/tv_bingo_show_vandredno_kolorr3hp.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/0jjNeSl/download_brasfoot_2020_registro_gratis.pdfIn PDF document text
    • https://cdn.sqhk.co/disegivoji/AjfidTP/supreme_duelist_stickman_apk_hack.pdfIn PDF document text
    • http://kozupuj.iblogger.org/google_sheets_drop_down_list_from_range.pdfIn PDF document text
    • https://cdn.sqhk.co/xumirikebixo/hihbBUQ/yandex_browser_alpha_apk_old_version.pdfIn PDF document text
    • https://cdn.sqhk.co/vobipibomuk/gzehdhg/drum_set_notation_software.pdfIn PDF document text
    • https://cdn.sqhk.co/duzupafuj/pJt6ihX/jidefidunapad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://galikamot.epizy.com/du_b._tech_application_form_last_date.pdfIn PDF document text
    • http://pamapubosozule.epizy.com/gift_certificates_templates_libreoffice.pdfIn PDF document text
    • http://xikapewegoruzom.epizy.com/pofebigasovuwotewuwakoz.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_off000103bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BF 5356 bytes
SHA-256: 6977795912827305e27de90c68ec1e9cd276ceeb289ccdfc451716c4ef58cba2
font_01_sfnt_off00011603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11603 10892 bytes
SHA-256: 602413d7eb2dc8728087dfb6883167fdd4e25c8f20183f33249e2ffc137934a0

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