Malicious PDF — malware analysis report

Static analysis result for SHA-256 590bb080cf98ab08…

MALICIOUS

PDF

71.7 KB Created: 2020-11-12 18:16:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7d37220216351b2008f392d79e1d6684 SHA-1: bfd5904f5ab04a675709bfcecb117b0385b9fbe6 SHA-256: 590bb080cf98ab08d095ba58d93a6cfd28f97c56c493eba81a43c6e4ee1f6f56
116 Risk Score

Malware Insights

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

The PDF file contains a malformed stream and an embedded URI pointing to a suspicious domain, indicating a phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'El witcher 1'. No scripts were extracted, but the presence of a malicious URL is a primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://trafficel.ru/strik?utm_term=el+witcher+1+guia+eliteguias PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427538/normal_5fa4c986b6831.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387054/normal_5f8f2a0bb9b2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443812/normal_5f9d9e4b6cdc5.pdfIn PDF document text
    • http:////guides.gamepressure.com/thewitcher/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/gesuxakedu.pdfIn PDF document text
    • https://s3.amazonaws.com/xatojem/25217758317.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8db667f-83a0-472e-9da7-b19f87db8af8/59586233163.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/2169180498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/596ed18b-bcdf-4b2a-9e9d-2e2d2623c9cd/67332369875.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/255aca47-28ec-409c-9aa6-bf989728f68d/wofivimadixijizonenaf.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/garozorazajesor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fe5c54c-456d-4a42-8dda-099c8fbe62a9/75299942990.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aa326d2-cf41-4641-b009-4d06860be560/95951819435.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/766333cc-47d1-4c39-986a-7409784cc457/1071402061.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/vocab_level_g_unit_3_vocabulary_in_context_answers.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_off0000cad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD0 5160 bytes
SHA-256: f8e69a2b0cb8efb0a060a5acfac8fbfadeb8b824497edbfab285f788ed3609e2
font_01_sfnt_off0000dc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6B 3612 bytes
SHA-256: da8026154489feaebf11d937834399383be84a71bfc7ecf47f6fcffbdee2a445
font_02_sfnt_off0000ea9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9F 11676 bytes
SHA-256: 1d6e78f814e0ac24120216199457b82d4dd7db262e7d76a404febccbb0141183

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