Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d48fb5fc39bba5…

MALICIOUS

PDF

77.7 KB Created: 2021-02-25 20:25:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: f250c2f8d1265d02af481db5a4173cad SHA-1: e8c2fb4232281a33b7d708d581d9dda007e4707d SHA-256: a6d48fb5fc39bba565702ba5cb3a9b8fa0be09a11cbc388301ce5d8e48bcec3f
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 disguised as a document about tonal harmony. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The embedded URL is the primary indicator of compromise, suggesting the document is a lure to a malicious site.

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://druttle.ru/123?utm_term=concise+introduction+to+tonal+harmony+2nd+edition+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375541/normal_5fcb5570d580c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453754/normal_5fee859015f74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501233/normal_5fdf11879b461.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379616/normal_5feb2648adf9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477181/normal_602b9adacb0e8.pdfIn PDF document text
    • http://topstudy.fun/friday_parent_portal_old_bridge_high_schoolh6vw7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374532/normal_602555ab26eea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461249/normal_602bf59ba2220.pdfIn PDF document text
    • http://gagivukamuw.getenjoyment.net/backbeat_fit_6100_wireless_bluetooth_headphones_sport_sweatproof_and_water-resistant_camo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414341/normal_5ffa7bfc9233c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gapivegek/2702957903.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/sunudelotizivifemubimog.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/bahamas_heavy_plain_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/58926875397.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7C 5532 bytes
SHA-256: 5afd17f8434ebd08b69cdfe7a05f3f622b37d5487d3a842e7de49a8a5c4da209
font_01_sfnt_off0000df22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF22 10820 bytes
SHA-256: 59c6b35cb3ee100ac17c9cc097da43c27ab0f0e526bcea6e61ac958c6e7ff55b
font_02_sfnt_off00010459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10459 16084 bytes
SHA-256: 462d13bd97d7d9b38b38dac4ddb889f891d4742debcdf3bbf084b15d68e01d41
font_03_sfnt_off0001190f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190F 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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