Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81991cf4fbb5d41…

MALICIOUS

PDF

74.4 KB Created: 2021-02-20 03:36:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 267979bbc8c23d80ecad560089e7be82 SHA-1: ef95e8197bfaed4ce7302f5f10c26274f75349e5 SHA-256: a81991cf4fbb5d4148f28dd551d454da6836b4d8b77f6885bdb46300efde845a
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, with a high risk score. It contains an embedded URI pointing to a suspicious domain, which is a common tactic for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site.

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://seumenha.ru/strik?utm_term=php+convert+html+string+to+json PDF link annotation
    • http://lbaranaydin.com/gekegozevugalugufefiloleqpq3i.pdfIn PDF document text
    • http://damvglaz0.xyz/373713898906cm1e.pdfIn PDF document text
    • http://anbieterbewertung-autoscoutch.com/free_cinquain_poem_templatebqhl9.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/jdbLQqP/9932572944.pdfIn PDF document text
    • http://vafijevimam.iblogger.org/railroad_commission_of_texas_form_w-_3x.pdfIn PDF document text
    • https://cdn.sqhk.co/pojizurigos/D9ifhe6/lofatikotamagogekomowape.pdfIn PDF document text
    • http://ostanni.fun/mivomugynq38.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/cover_lagu_tami_aulia_hampap3nud.pdfIn PDF document text
    • http://reduslim-italia.website/whatsapp_status_long_video927us.pdfIn PDF document text
    • http://investorlands.ru/tedumukubiteniluk30485.pdfIn PDF document text
    • http://vizit.store/2001_mazda_protege_repair_manual_fre0lh6l.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/vizegemawokaxe/bernie_madoff_scandal_summary.pdfIn PDF document text
    • http://besenasoxa.epizy.com/casio_mudman_solar_atomic.pdfIn PDF document text
    • http://voruluju.epizy.com/cuneiform_script.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/rixomezofu.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/28059158533.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/dignity_in_dying_report.pdfIn PDF document text
    • http://zerekigukazaja.epizy.com/stryker_retrograde_femoral_nail_technique_guide.pdfIn PDF document text
    • http://sabukizazuse.epizy.com/monthly_business_budget_template_excel_free.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_off0000e56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56C 5276 bytes
SHA-256: 834dbe82531c2bb87743dbd4287ec8623f28980c585e13c31ed01ab09c6db890
font_01_sfnt_off0000f74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74A 10804 bytes
SHA-256: 25ea64cc15f519c198e4497a0767ba740da7102cc73da3d05c00cca32ea773c3

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