Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92208ce19a86ff5…

MALICIOUS

PDF

65.3 KB Created: 2020-11-13 14:35:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b79264611e3f20436e133badee2e41d1 SHA-1: 9f17d20fb62850cafdb6e01f80498f8218dd0de5 SHA-256: c92208ce19a86ff5f787248c1cbb6b1bdba4350c56717f696c41776b66e37460
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URL that directs users to a quiz-related page, likely a lure for further malicious activity. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffnew.ru/123?utm_term=picture+quiz+guess+the+word+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375342/normal_5f8995a37ffde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369905/normal_5f8d2508159aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401972/normal_5fa15bed59ebc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402533/normal_5f99b096c0723.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375341/normal_5f8b10f0d24e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403407/normal_5f95495e914bb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/remeranexe/30116225881.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c441211-c364-47bc-a3cc-3efb649c6e00/xesazomasakasepojopul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37c63617-bfd3-40f3-b0ee-b74bbae09c99/bolisotulawuzoxuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cd57167-12f7-4b2e-ab65-ba495e46c34f/17478205654.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000acff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACFF 5440 bytes
SHA-256: 5b3430720719afd2cb6b09b6188e6b7ce74486474c1ea7c9070cec36e1772fc2
font_01_sfnt_off0000bf8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8E 10504 bytes
SHA-256: 68ef99d4945f8451b507125735779ea56dd8c988fab582ea390996b88754ad1d
font_02_sfnt_off0000e38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38E 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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