Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cfb3f929576c7de…

MALICIOUS

PDF

82.8 KB Created: 2021-05-19 18:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 34a73d2f567576d7f4b86dfb772a8dcf SHA-1: 9197031d124c690b8062cf1b327f1a674acbbb93 SHA-256: 9cfb3f929576c7de18b174e92fd8898d59b691175c1f614751f87004a500fc85
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, likely intended to host a phishing or malware payload. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, aligning with a phishing attack pattern.

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://bologen.ru/strik?utm_term=ascending+and+descending+order+worksheets+for+class+3 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4468531/normal_5fcd33bf32aca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446494/normal_606e47fe81721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484122/normal_60103a0bf2912.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487413/normal_6013c8396fa07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369318/normal_600d642e36c5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391634/normal_6021fc075524f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443617/normal_600a580a25f9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453900/normal_602a298079f90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_6040367de9db5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476783/normal_602550a8e886b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_6052728d74e57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414695/normal_5fcb48cc468dd.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/pomaxa/rodililazukevinatidusuda.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/47784569603.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/kigawulevituxanonu.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/sharepoint_hr_portal_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/bukunmi_oluwasina_hey_soundtrack.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ede5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 5504 bytes
SHA-256: d0887e18f5e8c41adf486174f8339eb36bb76a30c6d5013c5460c2ea84e088de
font_01_sfnt_off00010111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10111 5592 bytes
SHA-256: dd3f0bee6f707b3cf29f2954790c3090da8604c81406843d1db118bc1162c348
font_02_sfnt_off0001142b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142B 12500 bytes
SHA-256: d71ba7800537b4c25989e3f0548a8aa92693817b889813692314b5fdfe83c496

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