Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a859f60e4e9137…

MALICIOUS

PDF

84.5 KB Created: 2021-03-02 17:46:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 68b5a58fd05326330bf1ec27a17d3dcc SHA-1: cd87e009d7b4fea8a8309d562903866f865e4a4c SHA-256: 77a859f60e4e9137eaaa90b2e72c592e12800d5f718c53418ddd90f88537fa55
96 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating an external URI and is flagged by a machine learning classifier and ClamAV as malicious. The embedded URL, https://kuzutuzo.ru/strik?utm_term=are+princeton+review+gre+practice+tests+harder, suggests a phishing attempt disguised as a search result. While no scripts were explicitly extracted, the PDF structure and malicious URL indicate a likely attempt to redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=are+princeton+review+gre+practice+tests+harder PDF link annotation
    • http://zulurasovuguloz.66ghz.com/71373504755.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488569/normal_5ff4ecb4f2542.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421477/normal_602c1674abe53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419225/normal_5fe155980b9ba.pdfIn PDF document text
    • http://desokore.medianewsonline.com/golds_gym_xrs_20_olympic_workout_bench_exercise_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/togareguko/ehiQq7e/30730657996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472788/normal_6025141f50e53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475209/normal_600294d2827db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376126/normal_5fe0235ac9053.pdfIn PDF document text
    • http://waxosasovan.22web.org/35722128634.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420034/normal_603447ba4f17e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478141/normal_6007f988db436.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/ii6Kijd/xuruzapejel.pdfIn PDF document text
    • https://cdn.sqhk.co/jepipovi/cGLhche/vh1_behind_the_music_episodes_list.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lafosowewamute.epizy.com/adobe_acrobat_2017_dc.pdfIn PDF document text
    • http://noxebujo.epizy.com/how_to_prepare_income_statement_in_excel.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_off0000fea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA4 5232 bytes
SHA-256: 9499fdfa718aad8c6bbb3b63534b156df3ee71b4df45062f87c68ee401f197e8
font_01_sfnt_off00011072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11072 11124 bytes
SHA-256: dd228c1eaa39c8ed44129266ea91ff27a84cd97ef6aba68df2d8b162fd4d4438
font_02_sfnt_off00013651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13651 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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