Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8b8a3a5a7ea7bb…

MALICIOUS

PDF

76.1 KB Created: 2021-03-18 03:29:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d34f2a889d034224233ce2e9de1d3bb SHA-1: bfaaca77d429b62519b03cfa395fd82221393a18 SHA-256: ec8b8a3a5a7ea7bba2108550be73d95edb4715f0d36d8fd159ee983f36646f18
104 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'mezovuduw.ru', which is likely a malicious domain used to host or redirect to a secondary payload. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=jcb+js205+service+manual
    • https://static.s123-cdn-static.com/uploads/4389581/normal_5ff4ebc52d81f.pdf
    • http://rikeropovi.22web.org/suvabegopusurugijavuga.pdf
    • http://zebaxuf.iblogger.org/xilafebexaturovug.pdf
    • https://cdn-cms.f-static.net/uploads/4470205/normal_6011a913ec46b.pdf
    • https://cdn-cms.f-static.net/uploads/4369327/normal_60328e00b8f7c.pdf
    • http://sesopuligu.iblogger.org/infinitives_worksheets_with_answers.pdf
    • https://cdn-cms.f-static.net/uploads/4476294/normal_60142ef3388d1.pdf
    • https://cdn-cms.f-static.net/uploads/4448740/normal_60136cb09c1ea.pdf
    • https://static.s123-cdn-static.com/uploads/4503050/normal_5ff4c202806bb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wazotojemov/bpsc_pt_full_form.pdf
    • https://uploads.strikinglycdn.com/files/1304211c-71ef-4046-8a07-c5f4ec419ce7/46071846757.pdf
    • http://pejonoma.epizy.com/android_api_19_features.pdf
    • https://6bc61794-ec17-45f1-96eb-8bed4cd57308.filesusr.com/ugd/217b8a_f8b6c77ddcb14d20ae1a6b8dbe94c84a.pdf?index=true
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_e35f1e0ff1b5463085ecef58fc5590b9.pdf?index=true
    • https://1347de4c-4e54-429a-b84c-372e60bc5a2b.filesusr.com/ugd/6c98bc_bd0daf6177f64f7ba2f4569cdbb58ce5.pdf?index=true
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_e39028d5dee94912a716c8a459091b0c.pdf?index=true
    • https://s3.amazonaws.com/webipejonavuv/cyrano_de_bergerac_character_analysis.pdf
    • https://s3.amazonaws.com/posaxugidut/android_developer_salary.pdf
    • https://s3.amazonaws.com/gusule/dulejagapebipisamopid.pdf
    • https://uploads.strikinglycdn.com/files/157672da-1abb-4d18-9bcf-75147b5e0bfd/76770917854.pdf
    • https://uploads.strikinglycdn.com/files/88b13680-f53d-4ad5-95a9-09c8bd7ff0f0/xuvaxikurobozosu.pdf
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_2fc534c85122472b8cd2e7eeac816712.pdf?index=true
    • 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_off0000ea21.bin
0421f7a3448de3c4bac88c4ab40b03d63491bd6338d178a1ad778e5266ed41cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 5608 bytes
font_01_sfnt_off0000fd2c.bin
3e956eefefd1af79a7e839adb1f4cff33e5394ea1bf07a188c2476561b2bdcb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2C 10952 bytes

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