Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cef4dde2fd9f219…

MALICIOUS

PDF

66.3 KB Created: 2020-11-22 19:14:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bf5b14214d9eb84be8c58e5d4c00c52e SHA-1: 24fa436fad8cbd2c1cc77b4470529325c67dd3a6 SHA-256: 4cef4dde2fd9f2195d2b8f2845634d98bcd2d1f60398f24fd64804497765bd68
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds external URLs that direct users to attacker-controlled resources. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/123?utm_term=mythbusters+worksheet+to+the+video PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366402/normal_5f8e796c613e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387920/normal_5fab59c6dd4f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421461/normal_5f9f0fc3d5f90.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/effect_of_water_pollution_on_human.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e3d1866-8c4d-49bb-829c-622219a79fc1/laventure_lennui_le_srieux.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/white_collar_t_shirt_psd_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecd0c6fb-f99e-4390-9146-b57003c243c0/70710351730.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/journal_ledger_trial_balance_balance_sheet_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17274b4b-88aa-48ee-b229-c046d4cfaf12/kesinifufab.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/capstone_project_reflective_report.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/tarunezizuwoputaga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74d1a45f-4eb6-4286-bc86-1e90932b93eb/undying_blockage_poe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6b5e976-754b-4555-814b-3cf22883b729/concepes_e_tendencias_pedagogicas.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/btec_level_3_performing_arts_jazz_dance.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/vofiro.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_off0000c66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66D 5132 bytes
SHA-256: 9409db6b9e6f6ea3e4c9267fba2486c65b8de2456688a0e7b21963bd85a00652
font_01_sfnt_off0000d801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD801 10732 bytes
SHA-256: 07757790174bd1f29434f9d2ac30e277fa6f9824a7674eb67c4b401370bdbc81

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