Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec33da48abedc2a8…

MALICIOUS

PDF

78.6 KB Created: 2021-03-02 03:11:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7e6469437721640599820ee5f8fddc66 SHA-1: a11c72da9a29c503bd2df870cd52819d5a2b3dfc SHA-256: ec33da48abedc2a8a7fbb9bd085dc8d3808b29a80a670d4a50f826bb4f6d1739
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, suggests a lure related to tax refunds. The presence of an external URI and the ML classifier's high confidence indicate a malicious intent, likely for phishing or malware delivery.

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://mezovuduw.ru/wix?keyword=tax+refund+estimator+2020+australia PDF link annotation
    • https://cdn.sqhk.co/zefipuvuwifi/jhfihxI/zisuxigusalosuzopofotin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391898/normal_6015b6a7ed306.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384164/normal_5fd6e164dc25b.pdfIn PDF document text
    • http://kopogaxepaku.sportsontheweb.net/bikoxidugepokigujagasobo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463560/normal_602a0dd66b03b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385636/normal_5fd0f457755b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393188/normal_5fd8d2e1ddbae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381976/normal_60013abe3f441.pdfIn PDF document text
    • http://jaralet.getenjoyment.net/fozojunodazetewutuva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501660/normal_602738085409d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387571/normal_60184dbba3940.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447497/normal_5ffbb64497eee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408476/normal_5fc6aa1fb739e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481695/normal_5ff3bb977f348.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402488/normal_5ff69ebbb26f9.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/bajapovogam/ashampoo_winoptimizer_full_version_free.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/rich_man_s_frug_sheet_music.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_off0000e7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E1 5224 bytes
SHA-256: 662ffe77876ed1c26159429c4c59f87d267f79469182ccfdd61fed6aaddd459e
font_01_sfnt_off0000f98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98E 10980 bytes
SHA-256: 4fa8fd3c1d78a578e9ed54b946443057cbe6037f79d7bbc613c6d5be5bd1e9ad
font_02_sfnt_off00011f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F01 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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