Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff4a36c6daaadf2…

MALICIOUS

PDF

69.2 KB Created: 2020-12-03 23:49:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 851e520ce7ec976e74700af6d40d61d9 SHA-1: 189c75afdf149663241891ba73619632d40c9665 SHA-256: cff4a36c6daaadf291e3910e646c79486daf80ff2de7f85d8eb4ec2eb9e0542a
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. An external URI, https://traffnew.ru/123?utm_term=clubs+of+kingwood+fitness, was extracted, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of the malicious URL and the high confidence scores indicate a likely phishing attack.

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=clubs+of+kingwood+fitness PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418565/normal_5f9af894ac342.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/pujirageg/williams_intermediate_school_bridgewater_ma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c813ea03-7fcd-450e-83ac-5cffc08caaed/52527984186.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41811a68-57f3-48b6-8f1a-8bdc6ef78a9d/65410797519.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27c1cd35-167b-4daf-8008-d97fa79aa755/81458016692.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/14511187507.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/bovusukazatufalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fe84e5b-c676-4221-9a61-9430d930f943/bolsa_de_trabajo_cd_del_carmen_oceanografia.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/x32_digital_mixer_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d33427a199023ab4f616/t/5fc1603b145a8629dce478a2/1606508604499/xokanufijimudofuwez.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4aaabc819f1cf4cebbe2/1606372011085/mass_stoichiometry_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6378319e-e4e3-41ce-bc62-a9e20330fc9e/76025822405.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_off0000ce9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9D 4968 bytes
SHA-256: 938717c81aa16ce55a974b6d49319804c8fc1bed8c3492c32e5df67343f217b5
font_01_sfnt_off0000dfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAD 12120 bytes
SHA-256: 962da32e962ba0f4c8d1753bc4a9d63108cde11e674aa2bf769ac2b9b3cdfbbc