Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b6f212ce45ae640…

MALICIOUS

PDF

69.2 KB Created: 2020-11-18 11:49:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d0eca7079390f48c1266ddb162d74c12 SHA-1: 1f0d4187755f3c02cf16d8646af53b1b6bb900d1 SHA-256: 4b6f212ce45ae640ac2690c80687196b3fa66b5a1a5abf21103a32ac8d17fd05
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'traffnew.ru', which is likely used to deliver a secondary payload or conduct phishing. The document body, though heavily obfuscated, suggests a lure related to educational content ('four fours worksheet answers'). No scripts were extracted, but the PDF structure itself facilitated the malicious URL 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://traffnew.ru/123?utm_term=four+fours+worksheet+answers+hello+learning PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378155/normal_5faa4e57ee39b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446789/normal_5fa132bf8c976.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_5f86f5ce63e16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416791/normal_5fa8a34b3214e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f883ed70a848.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369310/normal_5f88a6cc46e10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384150/normal_5f8f347a45598.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454820/normal_5fa91e89143a8.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://uploads.strikinglycdn.com/files/3bbe6640-cb26-4731-a384-d5a984c349f6/glencoe_virtual_labs_photosynthesis_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7ed776d-e0e8-4c7c-a5ef-097032042c8a/zemisifigon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2c18454-50d6-4575-9bfa-5ea6bfe5d7a5/fnaf_2_toy_animatronics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d90d001-51d4-4def-b829-56433a904d0b/telecaster_deluxe_body_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02597336-f62a-4c10-a875-326ae753aab8/romeginuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7047c885-0a11-4932-9d31-1d61f11fb1f5/diesel_and_death_hacked.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_off0000c39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39B 5024 bytes
SHA-256: 1dc69279696fb8c60ef8e49e44aba707a1fd1f13f3dbfb5353b06241d0595a69
font_01_sfnt_off0000d4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C0 10816 bytes
SHA-256: 08b301ba231b6e8a032b774b3e4808c91b0453a161d0f757754d42e614c0e63e
font_02_sfnt_off0000f9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C0 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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