Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4bffb34f5d49c8a…

MALICIOUS

PDF

88.4 KB Created: 2021-02-16 20:00:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 00fee510a394910b367bdcd7dd1a8d47 SHA-1: ac923fc5219d4bfaf91354e4a5aa48c54221c849 SHA-256: f4bffb34f5d49c8afcda4e4c7dad6bb4d4cbf3d61f80bf7ec807aeb955e478d4
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI that redirects to a suspicious domain, likely intended to phish or deliver a payload. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URI suggest a phishing or malicious content delivery attempt, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wb?keyword=the%20crucible%20act%201%20plot PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4456687/normal_5ffbf151b4b8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421061/normal_60018d514426f.pdfIn PDF document text
    • http://petersikdar.com/blood_pressure_by_age_calculator_australiabn64t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428039/normal_5ff3f0e763a61.pdfIn PDF document text
    • http://help-feedback-amzn8.xyz/684074618028fege.pdfIn PDF document text
    • http://meetsucre.pro/78168252950sy92h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426830/normal_5fec42c620c63.pdfIn PDF document text
    • http://yourlivehelp.com/59716741549yk3pd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443578/normal_60258b63d4727.pdfIn PDF document text
    • https://cdn.sqhk.co/ledumixifer/PsihlE7/high_speed_racing_bicycle.pdfIn PDF document text
    • http://harmony-market.ru/su_dalgalar_fizikm8i3k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424011/normal_6019b0d4569f3.pdfIn PDF document text
    • http://albl.ru/nulujekalasazojelu79stg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/davubewu/retozadunatu.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/xorazekelodunodudoninu.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_off000120bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BF 4984 bytes
SHA-256: 7f90e2b0e3794768432ec9f67827625fcff84ba08985a3a70e9eb4ed8ccbf10c
font_01_sfnt_off000131ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AE 10436 bytes
SHA-256: fa9edd115bda2c2e9c08f89e383355a6a8a46a63937230a4ff74e3faa6d3924d