Malicious PDF — malware analysis report

Static analysis result for SHA-256 387fecfa4c078c29…

MALICIOUS

PDF

76.6 KB Created: 2021-03-22 19:17:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8ef75d8d745f3a9890004a3e24774088 SHA-1: e4a23816a39dbdb991153cb98afce843f5fb1d6c SHA-256: 387fecfa4c078c295b5901ec667cbafa26c81fa58e51d7533acaef073e0c824f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains references to educational materials, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://static.s123-cdn-static.com/uploads/4379486/normal_5fcbfb279584c.pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4457279/normal_5fcf7634e0686.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413125/normal_60007456b4db4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379049/normal_5ff6abda4b2a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370053/normal_600102841590c.pdfIn PDF document text
    • http://fortuneo-enligne.com/13928645657rjag2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391013/normal_5fc6539ca4c1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494891/normal_6031fe4752b65.pdfIn PDF document text
    • http://openlait.pro/tvb_anywhere_tv_box_apkkkm80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_600f54c27ed3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426269/normal_6033c777bd7c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497082/normal_5fe7d0551808a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465687/normal_600295f307f36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417658/normal_60009648d56e1.pdfIn PDF document text
    • http://top-agent.ru/rezosixawenugekadamibikuaxkvh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493891/normal_602c5e70524ec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/dRGGkpkNhSI/wb?keyword=hodder%20education%20cambridge%20igcse%20chemistry%20workbook%20answersPDF link annotation
    • https://uploads.strikinglycdn.com/files/e5a0fb09-2d8f-4edf-b509-f6b2f2436e70/72282058662.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fd65903-5f66-4b17-a661-c67c75130d7d/duwetunimifa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56bcb3c6-1cff-4895-b631-5f6e91e52f25/how_old_is_klaus_baudelaire_in_real_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bf4e0e1-5ab3-48c7-864b-080d178d8c37/xunovuzuruwikopole.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_off0000ebc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC8 5680 bytes
SHA-256: a13a3ca8dc2d406018b7fc4cc894adeec9b456eeb2c945724b62764887e05bee
font_01_sfnt_off0000ff00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF00 11156 bytes
SHA-256: e6499b838e14a2d54f0b89958871c831003f96d547b0d8f7b3e16fd0e9a5fe0b

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