Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9f91ff2e830494…

MALICIOUS

PDF

64.5 KB Created: 2021-03-15 05:43:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa1af43b156e3676d4abe2cc64e9c71d SHA-1: ac1cc2e599f3b93169702f44f3343931a44ffb3c SHA-256: 4a9f91ff2e8304947a066b4930e1a993ef7d8b098d9a326a539b5d7568a024f4
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'https://soxebez.ru/wix?keyword=tci+test+answers', which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, suggests a lure related to 'Tci test answers'. No scripts were extracted, but the presence of an external URI and the malware classification strongly indicate a phishing or scam attempt.

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://soxebez.ru/wix?keyword=tci+test+answers
    • http://boomerangoo.site/melamomoxunuwudigekixoduk0njkp.pdf
    • http://helper-badges.com/18104211608tp6a8.pdf
    • http://hydraruzxpnew4af.exchange/can_you_play_final_fantasy_7_on_ps5d0ry5.pdf
    • http://noxokolozoj.iblogger.org/cursive_writing_worksheets_for_2nd_grade.pdf
    • http://instasurprise.online/vufivoside5nvxf.pdf
    • http://qrastenmap.online/homelite_330_chainsaw_rebuild_kit76oyf.pdf
    • http://sdorovie-sustavi.xyz/593377261959t6qd.pdf
    • http://zajiledafalam.getenjoyment.net/html5_viewer_example.pdf
    • http://xazirinid.iblogger.org/81667228701.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nofalowi.rf.gd/jebuvakisetubosogonelefo.pdf
    • https://s3.amazonaws.com/pusolefosex/delinquent_account_on_credit_report_uk.pdf
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_4b31274a80754d4ea8d53f2179dd19d1.pdf?index=true
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_2fe3aec609ce4457a04fa18a303e133d.pdf?index=true
    • http://labutebumir.rf.gd/99263984029.pdf
    • https://s3.amazonaws.com/zepifudoxapo/ferevaf.pdf
    • http://mavavopem.rf.gd/instagram_activity_log_android.pdf
    • http://vuzuwukef.atwebpages.com/aristoteles_politica.pdf
    • http://mifedisiso.atwebpages.com/nomobevomegilid.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_off0000c1c2.bin
353cf229d6a696c4baebfba542a4cbc219c90d6215758872fcd78508bb2b7e3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C2 4800 bytes
font_01_sfnt_off0000d238.bin
b146a20e19f82175965bd2dc0eecfb098eb43d6ecf228a3871822a2ba7a3e9a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD238 10180 bytes

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