Malicious PDF — malware analysis report

Static analysis result for SHA-256 7309fba17713cb53…

MALICIOUS

PDF

79.6 KB Created: 2021-02-24 02:08:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 9c9bca9882ae0bea91282ea2394bb1f2 SHA-1: 004d1113b1cc849fb90f92596773348c2baf0951 SHA-256: 7309fba17713cb536de187953b19030a88243e013c43dd4057c07a638af76243
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on directing users to a link farm designed to host various PDF documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/wix?keyword=ap+human+geography+chapter+3+test+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490917/normal_602697e663a68.pdfIn PDF document text
    • https://cdn.sqhk.co/lakivasulis/suhiwij/business_management_and_administration_workplaces_and_tasks.pdfIn PDF document text
    • http://deine-gabe.com/verbal_ability_for_tcsic3zq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449599/normal_5ff7ce5ad0746.pdfIn PDF document text
    • http://poradoit1.site/suwamuxuti22xuc.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/ghe3Ege/43072181761.pdfIn PDF document text
    • http://numoxubur.iblogger.org/10699831347.pdfIn PDF document text
    • http://wititabeg.22web.org/vodesa.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
    • http://jeburam.epizy.com/codycross_answers_group_17_puzzle_4.pdfIn PDF document text
    • http://waxivetik.epizy.com/nizakozokaxupamuti.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/polycom_hdx_8000_configuration_guide.pdfIn PDF document text
    • http://getidevip.epizy.com/aylesford_school_warwick_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/manualidades_faciles_con_papel_paso_a_paso.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/sample_magazine_cover_template.pdfIn PDF document text
    • http://piwuzodoxomox.epizy.com/69793231135.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_off0000ec15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC15 5628 bytes
SHA-256: ea429b4a979b9bd88d46484e1a4e2ad5fb9a561b40c2e33837b7ce31b60a3477
font_01_sfnt_off0000ff12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF12 10580 bytes
SHA-256: 5b414323a63cc38964a29a9c3c813e35fe02aad4ce376a7bc5e7fa029845e763
font_02_sfnt_off00012312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12312 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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