Malicious PDF — malware analysis report

Static analysis result for SHA-256 461a6eb659b0d5c9…

MALICIOUS

PDF

71.4 KB Created: 2021-05-23 02:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 870e9605c6da2fefc8d687fef0ffe38c SHA-1: 733f4e4bd10cef5ac77fe97a12f600d0f39ede0a SHA-256: 461a6eb659b0d5c92f459e79610f449e2904c7ef518bcc43cc26fde64e899e85
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds external URLs that direct users to attacker-controlled resources. Specific URLs and indicators for this sample are listed in the indicators section.

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://soxebez.ru/strik?utm_term=days+of+the+week+lessons+kindergarten PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4406191/normal_5fc90b3e904ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384028/normal_604d1e5c4d0aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369907/normal_6046b00a5f8fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491159/normal_601450191240b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470968/normal_5fd900aa2561d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467571/normal_6018e00237681.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489733/normal_5fda6665355ed.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/suzujewa/free_math_coloring_sheets_for_1st_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/vakazevidujogeduzokig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/426e8f48-8ae9-4448-87e7-ce1ff0d3ba79/pioneer_vsx_522_repair.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/vejedopebularejazakiran.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/10979078335.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e4dabeb-fd22-4559-9ab6-e52d9f952764/rapobirumofisekibulifuxuw.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/22323481881.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/51232476535.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_off0000da14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA14 5424 bytes
SHA-256: d5fb45655f3f53b7f50cadb7d97d75478e27a51c8927a43b73b0d130d8b8f196
font_01_sfnt_off0000eca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA4 10520 bytes
SHA-256: 851d5186e8920c53bb33f4b60a4c8edd361dd41e0ae3d2560593a9ad7738976f

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