Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b0b38df899d07d…

MALICIOUS

PDF

70.4 KB Created: 2021-03-08 21:24:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 879b6abd1ee89642398ad76714d46303 SHA-1: 42d00891d851b22794f7d36399063f3229ae575c SHA-256: 05b0b38df899d07dd586855183d368895d4ae6946fb806c9c74083d9793dd5c1
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain, identified by heuristics as a potential phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of the external URI is the primary indicator of the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/award?keyword=converging+and+diverging+lenses+ray+diagrams+worksheet+answers+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4457592/normal_5ff24a169a4e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402014/normal_60344c6bb9d3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446502/normal_6039514814fa1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485156/normal_5ff3473520a87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443292/normal_600158d22b00c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421462/normal_603cae86890fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370268/normal_5fdb79710485c.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://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_070fee4ad9314f27be38f1b2bd9844e6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b438e284-97ad-4de6-ad87-10916376843f/96513390494.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/26433198233.pdfIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_e6727156ccda4209ae1c74709589e23f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/mytax_dc_gov.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/batch_file_renamer_2._51.pdfIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_1809220f8ebc4eb992ffeb7bdaf23b25.pdf?index=trueIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_a7c4490d4735404dbc53b7da1e4e3e90.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/tavusopapasifamefi.pdfIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_b45f4b06111f420d8d2399df60bac245.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c434c43-c4e9-46ab-8bcd-8850952772ea/7597774645.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_off0000c98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98C 5584 bytes
SHA-256: e4fef376304668fe3ef267fe133f607553e1feea19d9a3c0c2b1914347c0be49
font_01_sfnt_off0000dc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7A 9752 bytes
SHA-256: 2d1e29d1aba48a3a79257cb5baa9527b0b0256768549762e11ab6db72c47626f
font_02_sfnt_off0000fdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD3 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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