Malicious PDF — malware analysis report

Static analysis result for SHA-256 03bb6dc95efb91c3…

MALICIOUS

PDF

281.4 KB Created: 2020-11-25 22:51:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: bf1a97634ca1e32d007637c5134b2257 SHA-1: b77248d7b2eb612e66344e0c7017182491ab6377 SHA-256: 03bb6dc95efb91c3722fd8e5eb32ca6b240c40357861a2cb0a79869ba448b341
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating an embedded external URI and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though partially garbled, contains text related to 'Maiden holdings ltd annual report' and 'wkhtmltopdf', suggesting a lure. The primary IOC is the external URL found within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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://trafficel.ru/aws?utm_term=maiden+holdings+ltd+annual+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413368/normal_5fa67a64b3b5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423772/normal_5f9a605150ae2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472221/normal_5fa836c4c9924.pdfIn PDF document text
    • https://disebaxixifos.weebly.com/uploads/1/3/4/7/134714932/b712e237fc21ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370540/normal_5f8bca3986cff.pdfIn PDF document text
    • https://betutinixe.weebly.com/uploads/1/3/4/4/134481053/5381619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379038/normal_5fbd37d5dc033.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367289/normal_5f87dd0f4d683.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444102/normal_5fb387cf66c5f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca1acfd2-cce7-4883-b11f-ecb085fb771f/dados_curiosos_de_animais_sbias_que.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2579fee-8a9f-41d2-9667-760eec4f2f33/fatagepogegotafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f10b1330-1059-471e-b6f4-f9ecf844b89b/pemuti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1866168c-4b7b-4851-9346-773912e6d08c/73129013376.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caa2c365-513a-433a-b57e-142dc2efe902/grados_fahrenheit_a_centigrados_conversion.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00041cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x41CB3 5228 bytes
SHA-256: 6f0b7b019b9b6f242e75d3420d1ea7ddf3f5ddec6a292418f77574b01ca7e1cb
font_01_sfnt_off00042e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x42E7F 12172 bytes
SHA-256: 500d2cd86d396fb4d2b0205da6bbcf7e3a33900c4d128b714ca8dabd12c7e6fa

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