Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d9c83f5e59ff05…

MALICIOUS

PDF

83.9 KB Created: 2021-03-01 05:43:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 974d49841c4088b1c33603518c8c34f2 SHA-1: 5752a374db650c33660a62f4ff57e2762f44e91d SHA-256: a5d9c83f5e59ff05bf893b93c56e22ace5048659dcdcaa7add2df079fd7d57dd
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The embedded URL `https://resalured.ru/strik?utm_term=australian+bariatric+cookbook` suggests a lure to a malicious site. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to trick users into clicking on external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=australian+bariatric+cookbook PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421770/normal_6035ed9139151.pdfIn PDF document text
    • http://normab-id.com/pavedujafulifadobubezafozhpm.pdfIn PDF document text
    • http://joblanc.xyz/dixunemoginatotovexelige86men.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482625/normal_5fdc04a0e81db.pdfIn PDF document text
    • http://agreevudb.rest/7023461003265xx6.pdfIn PDF document text
    • http://nigoguno.scienceontheweb.net/how_to_clean_rainsoft_water_system.pdfIn PDF document text
    • http://bluebadgeapproval.com/plan_y_programas_de_estudio_2011_secundaria_artes_visualesuomy8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403276/normal_5fcfe6b5ae102.pdfIn PDF document text
    • http://hookup757.fun/sumipojunudetovadau43qr.pdfIn PDF document text
    • http://santaparker.store/67404245910v50mk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457305/normal_60356e1d9058b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403266/normal_6030cac73767c.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/tebipuregekut.pdfIn PDF document text
    • http://strapslap.online/xotujedowagogofuzonotivrz6z.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/wukevirenesu/verizanarezopigujugujo.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/comprehension_worksheet_grade_1.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/bounty_hunter_guide_service.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/2006_dodge_ram_1500_maintenance_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/sejakopa/letterhead_psd_template.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/covalent_bond_nomenclature_worksheet.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_off00010bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD9 4984 bytes
SHA-256: 4d8c02865178d576f2b866a791013cfcda47d8cfe3c00bb7096dd27b16af2869
font_01_sfnt_off00011cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDB 11200 bytes
SHA-256: 24af44b6e2a882263cbd0dec1b4e40af59d16b05903863f54be202880bf7d0bc

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