Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf97e074d1b69dce…

MALICIOUS

PDF

100.7 KB Created: 2020-11-24 03:57:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d00f414e3ab8cad593f8c6f4136d89c2 SHA-1: 916faddc6aad749a6e72992ec405abe04e7db138 SHA-256: cf97e074d1b69dce8726dd235d121cbaadf58ca0f87b87fa0144f3aa2ff27cfa
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. Heuristics indicate it is a phishing attempt, and ClamAV detection confirms it as malware. The document body, though heavily obfuscated, appears to be a lure related to 'Chinese character writing practice'. No scripts were extracted, but the PDF structure itself likely facilitates the redirection to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://trafftec.ru/strik?utm_term=chinese+character+writing+practice+b PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460058/normal_5fa63690a32b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447108/normal_5fb4c9b35d27d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420745/normal_5fac06bd4e270.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368731/normal_5f8be5e4979ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369796/normal_5f95585dcf99a.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/1fbc3969-96d3-4e5b-8c81-0585cad7c55f/pcg-61611l_drivers_download.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/track_and_field_score_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0973b450-3b62-4618-a4e6-ae6ec4bf19a3/hibritleme_ve_molekl_geometrisi_ders_notlar.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/chmod_command_linux_make_executable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7673a70-6df2-4d64-9bb2-46c23ab984e8/55171431778.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_off0000fd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD73 23312 bytes
SHA-256: 9c5cc638f9146cdbc047d37a2958d65a82b5eeb3d0560a95e094057f2d302a00
font_01_sfnt_off00014647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14647 5300 bytes
SHA-256: 829efd07f23bbe79ef7c8fc624f3d8dfc909873d009382d5ef884948afe6cb50
font_02_sfnt_off00015858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15858 15312 bytes
SHA-256: f1a81dbeebac7e9b3feee70bf0ba181da202b6c9cfac9893368ceb492b0848ce