Malicious PDF — malware analysis report

Static analysis result for SHA-256 536b21eabb1eaa2e…

MALICIOUS

PDF

78.7 KB Created: 2021-02-08 22:48:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 413fa49429d1e39cabef9635b44bee0d SHA-1: 74c69c77f1f6294f95309e7bf829ecb3437338d6 SHA-256: 536b21eabb1eaa2e906fb7c1cd435d282e83002b04d46d8fa429770a18e2a597
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains an embedded URI pointing to 'baarspo.ru', which is likely used for phishing or to download a secondary payload. The document body, though heavily obfuscated, contains references to 'Roblox shirt template maker online' and the wkhtmltopdf application, suggesting a lure to a potentially malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/wb?keyword=roblox%20shirt%20template%20maker%20online PDF link annotation
    • https://cdn.sqhk.co/wevexifimur/3ihsjgh/avengers_game_beta_xbox_date.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477400/normal_601fd31f0cc04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455176/normal_600f1852484b2.pdfIn PDF document text
    • https://cdn.sqhk.co/datolabevev/gcgcjeb/94656637310.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459163/normal_5fff7291e937f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486965/normal_6019dbf4d82c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369511/normal_60087db746749.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447093/normal_60012da4e4b95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465136/normal_6006cc1ec12ed.pdfIn PDF document text
    • http://dirugalaw.22web.org/invoice_templates_excel_free.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://rakulewozagax.rf.gd/employee_provident_fund_form_13.pdfIn PDF document text
    • http://fopagozijudiri.epizy.com/heads_up_concussion_fact_sheet_for_parents.pdfIn PDF document text
    • http://mibofive.epizy.com/aluminium_panel_sheet_hs_code.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_off0000e9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F4 5128 bytes
SHA-256: 945737a4c1b8c50df3300b41f617ac8f89c5f1e3d896810dad4d20ed9106b588
font_01_sfnt_off0000fb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2D 10808 bytes
SHA-256: a2481e907a1844e174e962bb254bf034d9bb267c72c07f98cd4e52d4b57d6c2b
font_02_sfnt_off00011fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE8 4324 bytes
SHA-256: ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c

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