Malicious PDF — malware analysis report

Static analysis result for SHA-256 20739a6f62633242…

MALICIOUS

PDF

81.0 KB Created: 2021-06-09 12:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c98d003c71c383c877ad3efc0129360 SHA-1: 80fe7f94068993560196a2fe271b6fd72b4047a4 SHA-256: 20739a6f62633242ff0e3ccc0fb0cf5458bb5e42f1a769cd3df143a3a2009de1
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains an embedded URL that directs users to a suspicious domain, likely to host further malicious content or phishing pages. The document body, though heavily obfuscated, suggests a theme of educational content, specifically IELTS speaking, to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cructi.ru/pbw?utm_term=ielts+speaking+education+part+3
    • https://cdn-cms.f-static.net/uploads/4491412/normal_6023b0b92086b.pdf
    • https://cdn-cms.f-static.net/uploads/4503279/normal_60181e02e3ccf.pdf
    • https://cdn-cms.f-static.net/uploads/4373999/normal_604e8166b11a0.pdf
    • https://cdn-cms.f-static.net/uploads/4446762/normal_603d282800ac5.pdf
    • https://cdn-cms.f-static.net/uploads/4476768/normal_5fe673a3a58da.pdf
    • https://static.s123-cdn-static.com/uploads/4412593/normal_600452f2ddc9c.pdf
    • https://cdn-cms.f-static.net/uploads/4493198/normal_600dab1d49ef9.pdf
    • https://static.s123-cdn-static.com/uploads/4459319/normal_6004a4ee19da8.pdf
    • https://cdn-cms.f-static.net/uploads/4370285/normal_60507373cb41e.pdf
    • https://static.s123-cdn-static.com/uploads/4447450/normal_5ff03a2e9c729.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://liwuvedesisu.pbworks.com/w/file/fetch/144526599/simla_mirchi_movie_hd.pdf
    • http://jutifakukap.pbworks.com/f/how_to_pass_medical_assistant_exam.pdf
    • https://uploads.strikinglycdn.com/files/c743d34e-b657-4356-ac99-8107ab39472d/zurogus.pdf
    • http://nusuwoxub.pbworks.com/w/file/fetch/144426978/97737793848.pdf
    • http://nosiravuga.pbworks.com/f/how_to_calibrate_treadmill_incline.pdf
    • http://nigezid.pbworks.com/f/41426307794.pdf
    • https://uploads.strikinglycdn.com/files/be171d66-2353-40bf-b341-c11f53460609/xexefevuvopujilulalubi.pdf
    • http://larabefejaji.pbworks.com/f/25564193818.pdf
    • http://sapixesut.pbworks.com/w/file/fetch/144705540/what_does_mission_analysis_means.pdf
    • http://sidotafawe.pbworks.com/w/file/fetch/144756861/xolekanop.pdf
    • https://uploads.strikinglycdn.com/files/e20f7d0c-05ca-4cb8-b049-6a8e2c5eee07/9638272588.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebde.bin
9a386040eee1295cef995cdd1dbc32160befeb313c242d93cdc863f70d805cba
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDE 5408 bytes
font_01_sfnt_off0000fe53.bin
63c74af9faa8b0c6bb40fff41a0a515fcf5235663774b16d7f521da974da58a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE53 22704 bytes