Malicious PDF — malware analysis report

Static analysis result for SHA-256 24825f2eab43250e…

MALICIOUS

PDF

74.3 KB Created: 2021-06-12 12:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1c640a4991520a06d57fec7d6b3496ba SHA-1: 33c4e9e4ada44c3d365fc97c18d6c7d05ee38c8b SHA-256: 24825f2eab43250ea8aae8145b7931d1b60f1002d96bceba21e0c9905a37f0da
104 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URI pointing to 'synerhu.ru', which likely serves as a download link for a secondary payload. The presence of a 'download button' heuristic further supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/pbw?utm_term=combinatorics+and+graph+theory+techmax+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462339/normal_5fd7d9306479e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410462/normal_5ff5a75ba7027.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393639/normal_60402e01e649b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464850/normal_604a1b022c242.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473971/normal_5fcfb2ff2c430.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414152/normal_60321cabbae51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424682/normal_5fd84cd172ef1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377704/normal_5fefdd9a85620.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366057/normal_602a2d6edb57c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421764/normal_6009bf37bfe6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451760/normal_5fe8666367ba4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376382/normal_5fe04fbe72e93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469847/normal_5fc84407320ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366040/normal_60268bca2d4a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490542/normal_5fd0e5e5d0949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423732/normal_60381c448d91a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407818/normal_6056c45388eda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460463/normal_600c14fb5871d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450724/normal_6030ec7cf2312.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/9cb506a1-3269-402a-b72e-a149a96aacfc/case_580_super_k_backhoe_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2309f306-57bb-4c42-a994-c41c7373739b/libro_de_espaol_de_segundo_grado_de_secundaria_contestado_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf53c8a0-07a3-4306-976e-cb0cbdc2b462/which_mixer_attachment_for_pastry.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_off0000e284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE284 5752 bytes
SHA-256: 90ebdc2d75c7e79e6c167ea9c741a4161bbd77f20a635be62626fbd59962afb3
font_01_sfnt_off0000f5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F8 11336 bytes
SHA-256: d0c173ed5020e3fab7b50ea89d4c0b7965d87512dd3941912892013835a26146

Open this report in the interactive analyzer, or submit your own file for analysis.