Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7884f95ae6ccef…

MALICIOUS

PDF

63.1 KB Created: 2021-02-11 12:25:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 3c439f0d801b3f4b0600eebcb9d8bf9c SHA-1: c0ddf4517c27839106555e635bb183d33cfff99a SHA-256: ef7884f95ae6ccef44e48261c6cd32fdc572921aed8b712768cdd30f7c4d4122
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URL that points to a suspicious domain, identified as malicious by ClamAV and ML classifiers. The document body, though heavily obfuscated, appears to be a lure related to a study guide. The presence of an external URI and the overall detection by multiple security tools indicate a phishing or malware distribution attempt.

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/123?utm_term=chromosomes+and+meiosis+study+guide+6.3 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486346/normal_5fefbd478c8e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502268/normal_5fd8e7c588027.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367947/normal_5fdef18eaf612.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383795/normal_5fe834e024654.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485939/normal_601f0ddf39e1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444377/normal_5fe64b4bafc40.pdfIn PDF document text
    • http://copyright-help-report.com/examen_medico_laboral_formatoud8qr.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/zagubip/nasevizagem.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/mumanulagokosakapetefukix.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/brightburn_tamil_dubbed_movie.pdfIn PDF document text
    • http://kabudevegal.epizy.com/wubedixogewemawogavaxoxid.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/75996152255.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/8143928909.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_off0000ba9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9A 5564 bytes
SHA-256: f5ba9958c744583a0d9707200270e7662553931ffc04f1da7f850ec9ed57ba84
font_01_sfnt_off0000cd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD61 10012 bytes
SHA-256: bcb7204da9f21b70e0b787972f3670bdc860f12221063e89e35ccebb5abb16e1