Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d79cdbd1c491c8b…

MALICIOUS

PDF

68.2 KB Created: 2021-03-01 01:22:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 018bd78491687b9fa61bf8cc61ccf7a7 SHA-1: e55df37c2584ed6ed4ab3e960fae204b58b4f731 SHA-256: 8d79cdbd1c491c8bf82fe836595d8e2f1d592fc0eec52285928b7acb60090647
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that mimics a search result for a free PDF download, likely intended to trick users into downloading a malicious payload. The document body is heavily obfuscated, preventing a detailed analysis of its specific content beyond the initial lure.

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://nipisod.ru/wb?keyword=nursing%20drug%20handbook%202015%20pdf%20free%20download PDF link annotation
    • https://cdn.sqhk.co/kegetaxob/5JpEjgf/45786627022.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445729/normal_6016790fd6682.pdfIn PDF document text
    • https://cdn.sqhk.co/jabisopomuxo/jUigfjf/transfer_case_control_module_2008_silverado.pdfIn PDF document text
    • http://reduslimer.website/glitter_platform_court_shoes_uktwaxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379841/normal_600a426756d38.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/OxQiaie/lifakek.pdfIn PDF document text
    • http://shopmzm.site/61703105966fb9f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473947/normal_5fdd9b6db9756.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvaworizon/cQ0eiiy/52636804534.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/jbhdojf/bimusedolofusojojipof.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/YzjfjbO/italian_remix_music.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450041/normal_5fce8de38b2c3.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/fedure/61898819658.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_off0000cc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC78 6020 bytes
SHA-256: 635cf949d1d09f5b53366940c62b4f6e162c9d279527ddc31154d9c9f45d6702
font_01_sfnt_off0000e10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10B 10272 bytes
SHA-256: 63dc4cf86b06ce564023a31de26fadd8c67cb92baebbd4303bf065a9d9d320eb