Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3d60a0936c3797…

MALICIOUS

PDF

69.0 KB Created: 2020-12-15 17:07:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 62e179c78dadbaef7c38ce9681a89837 SHA-1: e45e0df671ef2dcafd77828863e25e0e8e0de0fb SHA-256: 4b3d60a0936c3797355690148379bf72ea84cdf0985974eeac659ef13786fca5
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a phishing or malware distribution site. The document body is heavily obfuscated, but the presence of the external URI and the overall malicious verdict strongly suggest a phishing or downloader 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://traffnew.ru/123?utm_term=living+worlds+apart PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379984/normal_5fa9566c1997c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485004/normal_5fb7e32547d12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394073/normal_5fafd3712f01c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_5f9326950c109.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390324/normal_5f989e48d2e80.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/dupula/57271865442.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/tcs_medical_certificate_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/famagibusafara.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4bd6f3de5e49b55a7f0b/1606372312881/pb_fit_powder.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5709f2bbd740658251595/t/5fc943c956acec624b6c73dc/1607025611642/wedding_nail_salons_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/sharechat_app_in_telugu_2019.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe3eab2dd96f5918ba356d/1606303404877/fairfield_central_high_school_logo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf49cb18e72e5fdbcdbed0/1606371788944/vivukezesekuzemutabikota.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/damodaran_committee_report.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_off0000d1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BF 5220 bytes
SHA-256: c3fe4945972dc823c8a75109c6e0285997bc8a04ca6569d0383b7609e564ca54
font_01_sfnt_off0000e3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A9 10620 bytes
SHA-256: d73be56b10fc1be2454e1a53ab2f2b566c62eb0dae7a854d3b353e1555a5cc27

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