Malicious PDF — malware analysis report

Static analysis result for SHA-256 3740a9513e3cf26f…

MALICIOUS

PDF

68.3 KB Created: 2020-11-19 09:04:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2f9a8c7b3d9482cf0491e209b1de4d34 SHA-1: bef6cf4eb2a761d7e77a706ffd8f8dc5dc2c4705 SHA-256: 3740a9513e3cf26f64574fef5fefa1f19751def0cff7d253b282b7a494c930ff
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a specific detection name indicating it's a phishing trojan. The embedded URL, disguised as an answer key, strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristics indicate it's designed to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafffi.ru/strik?utm_term=al+kitaab+answer+key+pdf+part+1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367927/normal_5fb303b5c57a7.pdfIn PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/8768087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372072/normal_5f912028d69a5.pdfIn PDF document text
    • https://wurikosaradusif.weebly.com/uploads/1/3/1/3/131384544/wepitetazeke.pdfIn PDF document text
    • https://lozulijulejibog.weebly.com/uploads/1/3/1/8/131857057/7244574.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
    • https://s3.amazonaws.com/zetare/dixevonozotareguxuromita.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/53853932353.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/eosd_for_busy_person.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/semaw.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/the_spectacular_now_subtitles_english.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_off0000c1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AC 5152 bytes
SHA-256: 449e0f3ab4052b667c581c28b716ff517cf66d2dbcde955af1af8934a3a3cbbf
font_01_sfnt_off0000d345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD345 10284 bytes
SHA-256: 991e4a278a274f170bc49237ba9f255b5b718951f7096031d25b62a0ae00dcda
font_02_sfnt_off0000f638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF638 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361