Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3aec20af6022a2…

MALICIOUS

PDF

73.5 KB Created: 2021-01-30 05:53:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: b9be0bfc2e214344eaf0a5b2a38c02d1 SHA-1: 7541d3a58645df4ab3835ca3f10383842c48a0b3 SHA-256: dc3aec20af6022a22819daf187b6c0906b936e46879b56a691b170b1526c920e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to external sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/aws?utm_term=activtrades++metatrader+5 PDF link annotation
    • http://cleaner-inn.club/barber_shop_haircuts_beard_and_mustache_championship894y6.pdfIn PDF document text
    • https://cdn.sqhk.co/barugogip/bYhhwhd/derwent_lightfast_pencils_12.pdfIn PDF document text
    • https://cdn.sqhk.co/jadosoxiko/hejgifB/knockout_epic_race_3d_model.pdfIn PDF document text
    • https://xirabefutabo.weebly.com/uploads/1/3/5/3/135323672/sogox.pdfIn PDF document text
    • https://cdn.sqhk.co/jizuxadif/5gehjrf/57517820973.pdfIn PDF document text
    • https://cdn.sqhk.co/jifigetuxu/gfwjjjR/94468316942.pdfIn PDF document text
    • http://xviiivbgz.com/2015_toyota_highlander_repair_manualqw99v.pdfIn PDF document text
    • http://nnorm-id.com/business_data_communications_7th_ediu6an1.pdfIn PDF document text
    • https://wozavosasegug.weebly.com/uploads/1/3/4/5/134509229/7233591.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/lefemijip/metopuradedafozu.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/8085_microprocessor_architecture_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/cambridge_advanced_learner_s_dictionary_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/christmas_song_sheet_music_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/nefug.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/conclusion_paragraph_for_internship_report.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/zolazadibul.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_off0000e41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41E 5228 bytes
SHA-256: 16448e34a51c3e907c8355616e145a81dda0ae1274facc531b0350787241c28d
font_01_sfnt_off0000f5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DC 10260 bytes
SHA-256: 6ff24c66934efb46681a5e137390047a3ffbb76a919de7d10069a4759866b669

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