Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ebc71b6bf68e8d…

MALICIOUS

PDF

90.3 KB Created: 2021-02-21 02:21:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1e517dcbb2b089bfe57fc36e845b4fd3 SHA-1: fe91a9fe0e189b73e8443e2fd32e3aeb1f899043 SHA-256: c3ebc71b6bf68e8deea0fa5c31b14a18b4241004bf2f44144dafa9b45e18adb1
96 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URL pointing to a suspicious domain, identified as malicious by ClamAV and ML classifiers. The document body, though heavily obfuscated, appears to reference musical notes, suggesting a lure to disguise the malicious intent. The presence of an external URI and the overall detection by security tools indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=the+entertainer+music+notes+for+piano PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459623/normal_6007a92703516.pdfIn PDF document text
    • http://vorecan.fun/biroxumen935rq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499633/normal_6023c7a35f021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374188/normal_600f4d34687e6.pdfIn PDF document text
    • http://daimontimur.org/70972059485qq9c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494681/normal_5fe3c1a3c5fdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407810/normal_601cc936d1911.pdfIn PDF document text
    • https://cdn.sqhk.co/zewumirapeb/aoItawv/among_us_wallpaper_hd_android.pdfIn PDF document text
    • https://cdn.sqhk.co/pavujakorige/ahiigeW/moto_camera_2_apk_xda.pdfIn PDF document text
    • https://cdn.sqhk.co/xurazegoba/ijOLhdh/texas_longhorns_roster_2005.pdfIn PDF document text
    • https://cdn.sqhk.co/dejenuluzew/jfegcic/download_eve_special_forces_mod.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/wunupalezozerud/vigul.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/77938457678.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_off00010d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3A 5172 bytes
SHA-256: f4eaab8821b6e37ddb35d749290d52d7faf3a7f33f63b52aacc8ebfd7d3feec7
font_01_sfnt_off00011ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA9 11556 bytes
SHA-256: 9977bfa0a7635d14453020057509a6560ab4faa36c49a3b355ee6576da194fc0
font_02_sfnt_off00014644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14644 16200 bytes
SHA-256: f4fd55ddcbd8ce9ebd7b22767d40bbcfb10373bf2e4442ea370447971bbdb078

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