Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8592357fe79145…

MALICIOUS

PDF

76.9 KB Created: 2021-02-01 16:31:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9732ee0d632e1fa53d671f34821397f9 SHA-1: 6645d1df1d34f68387cd5ca4951d6f69f0b4cfd1 SHA-256: ef8592357fe79145af129a714b21406a5bde27dae84b411fa88dff64e7496e39
96 Risk Score

Malware Insights

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

The file is a PDF document flagged as malicious by ClamAV and an ML classifier. It contains an embedded URL, https://jacksth.ru/aws?utm_term=data+structures+and+algorithms+tutorialspoint+pdf, which is likely used to deliver a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to technical topics, consistent with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/aws?utm_term=data+structures+and+algorithms+tutorialspoint+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4419832/normal_5fdcf68240ea7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460476/normal_5fef7b0b5f2b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368251/normal_601468a5c6fd6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369776/normal_5fede282d7e22.pdfIn PDF document text
    • https://cdn.sqhk.co/gavezexu/1BgecWx/change_outlook_auto_reply_from_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/fifotadog/x7ihibs/61218152828.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372376/normal_5fc7d459c19f0.pdfIn PDF document text
    • https://cdn.sqhk.co/kerosumumato/cgjdpqB/mcps_desktop_marion.pdfIn PDF document text
    • https://cdn.sqhk.co/texirova/lifdqp4/jutat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479226/normal_6015d029e60fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484114/normal_5fca5b5520d43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464862/normal_60017391a95f3.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/nitirew/39488190247.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/60583290529.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/benoy_kumar_sarkar.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/birthday_card_making_template.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/30639806452.pdfIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/sofugilemimajasi.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/input_file_accept_only.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/bainite_formation_in_steels.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/47731693864.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92A 5568 bytes
SHA-256: 1f2f5a8701502f835d0139dcee93966f883f93934f4307b00f1a6390caea12ee
font_01_sfnt_off0000ebf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF1 10624 bytes
SHA-256: 714a08ecbcc0318f4de146c0f827f899f30e10148d76f9084e741ff30faae165
font_02_sfnt_off00011099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11099 16112 bytes
SHA-256: 275d0ef8f619a30f75d5b67021c85ffe51dbf44d82a44ecb2d07128ff93f9399

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