Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a140f7097b4e4a…

MALICIOUS

PDF

78.6 KB Created: 2021-02-24 23:03:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 00ab637a13637c584ac8d6f9e794e0fb SHA-1: 5e1e94ef39c75967c82ac2550e346bc67a9c18aa SHA-256: f5a140f7097b4e4ab5a83215cc47d244e39011988dfe7e25eb4a38ed37b4b49a
96 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The embedded URL, https://leonvi.ru/wb?keyword=what%20is%20the%20viscosity%20of%20automatic%20transmission%20fluid, is likely part of a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to trick users into visiting a malicious site, aligning with spearphishing tactics.

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://leonvi.ru/wb?keyword=what%20is%20the%20viscosity%20of%20automatic%20transmission%20fluid PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4477400/normal_5febcfbaecaf2.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/vuterijoze/nerunilenitem.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/riposofolujowozenonukir.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/canter_assertive_discipline_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/landscape_estimate_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/20459926048.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/bipiramufamotetub.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/internal_audit_report_writing_skills.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/can_i_watch_sharp_objects_on_amazon_prime.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/30272839743.pdfIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/lukas_graham_7_years_old_song_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/nifusipe.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/farmacos_anestesia_geral.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/beach_formal_wear_for_weddings.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/49305750101.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_off0000f64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64A 5436 bytes
SHA-256: 343fd8f00470e83b243d8af0302d6514b37cf49cb491240dd4c9d346005379dd
font_01_sfnt_off000108b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B2 10664 bytes
SHA-256: 96d493438967820ba2d70d75fc689b75f232e17f4b615d82fbf46d2b09c2e158

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