Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a79c0af75d6157…

MALICIOUS

PDF

69.0 KB Created: 2021-02-12 15:39:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e566168c9190a47d64fd38e7f22054eb SHA-1: 3fca36830fbe65398da9b5001141ca52c5e53fd5 SHA-256: 58a79c0af75d61577d9cf85c56fca8e0582589bc67e2ca90ee2dd531c4ff06d9
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF with high confidence. The embedded URL likely serves as a lure for downloading unwanted software, as suggested by the URL's query parameter 't+torrent+pro+1.5.9+apk'. No scripts were extracted, but the PDF structure and embedded URI are strong indicators of 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://jottigo.ru/123?utm_term=t+torrent+pro+1.5.9+apk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4425256/normal_5fefcaec9c429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462678/normal_601b3be2372b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485927/normal_5fdc389be6515.pdfIn PDF document text
    • http://bluhgang.best/appium_desktop_for_windows737q6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405206/normal_6015b906c54c3.pdfIn PDF document text
    • http://cooldomen.space/nystatin_davis_plus0dxdb.pdfIn PDF document text
    • http://hangookoil.ru/lsc_smart_connect_applicationmkion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408596/normal_60231b6821368.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371787/normal_600124732ff92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473954/normal_5fd91b0918634.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/rujimidujek/baroque_script_normal_font.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/rovutosemizejumanifim.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/disonexirajegitados.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/best_open_source_calendar_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/excel_spreadsheet_file_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/rexonulize.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_off0000d1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A8 4980 bytes
SHA-256: cc12d8a5b7015ad65de7d3cd6856370f9d9941bfe632ad15e86d49ac284a115f
font_01_sfnt_off0000e2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BF 10756 bytes
SHA-256: c2b33adc7d150778a013358ad283283d7d6109aa8c0029ccfadf0d2db647bd45

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