Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a272cd3f212f43…

MALICIOUS

PDF

75.2 KB Created: 2021-02-27 17:52:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 573c85298ce71ad714ce7c13e5ac507d SHA-1: 9bec0963e4315d0cd52a1f5e2561313baa01b1f4 SHA-256: 66a272cd3f212f435802c25e0da1bac6aff0721d3f87d9ddf2ea211c36f31985
96 Risk Score

Malware Insights

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

The file is identified as malicious by a ML classifier and ClamAV, with a high risk score. It contains an embedded URI pointing to 'https://nipisod.ru/strik?utm_term=ng+book+2', which is likely a phishing or malware distribution domain. The document body is heavily obfuscated, but the presence of external URIs and the overall detection suggest a malicious intent, possibly to download a second-stage payload.

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://nipisod.ru/strik?utm_term=ng+book+2 PDF link annotation
    • https://cdn.sqhk.co/genamudazunu/jx5Bbih/ascii_text_art_iphone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376599/normal_5ff95882159a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464056/normal_5fdc46c7e26b0.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/U6ygcmZ/65643839984.pdfIn PDF document text
    • http://jaxaxanukijomel.22web.org/report_phishing_to_microsoft_365.pdfIn PDF document text
    • http://sazefakopek.iblogger.org/maxazujet.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/gM88iab/19992739245.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/GIhfNdw/58273980376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381531/normal_602e338d2d6a5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sipanokule.onlinewebshop.net/how_to_cook_a_pork_roast_in_a_power_cooker.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/budafosuginezo.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_off0000e923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE923 4644 bytes
SHA-256: b591b285fe164451bb935897da87eaba76586d82f1cd34f31def34605efe1576
font_01_sfnt_off0000f91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91F 11644 bytes
SHA-256: a865e5b820dcbf175b8f6f03c5e188b33fe896b3c04577f25a2382958b94956c

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