Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c55081d548a7c5f…

MALICIOUS

PDF

78.4 KB Created: 2020-12-26 19:07:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 1c57b0751669b36f9b9029d24af4cc3e SHA-1: e724bcb9f8602d3a0cb978bee5b740d484fc1caf SHA-256: 9c55081d548a7c5f39280616df3c2c54c8edada880a4413227b7ff9c4688152e
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It contains an embedded URL pointing to 'trafffi.ru', which is likely used for phishing or to download a secondary payload. The PDF structure and embedded content suggest an attempt to trick the user into clicking the link.

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://trafffi.ru/aws?utm_term=condiciones+para+el+aprendizaje+significativo+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369161/normal_5fb58cd571ade.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421040/normal_5fe03e78adebb.pdfIn PDF document text
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/vajebizu.pdfIn PDF document text
    • https://viwuwobigoku.weebly.com/uploads/1/3/1/3/131378942/jafitetelana.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/vavebufevodutob/73735329226.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/guangdong_investment_limited_annual_report_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/vikilejuwevolepebagu.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/62045829123.pdfIn PDF document text
    • https://s3.amazonaws.com/potevip/dropcam_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55d5d98f-dd37-4335-aa72-489866f04b64/bolobuxabevapuxofatuxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ff85808-969e-4a6e-93ba-607233de42bc/61330317073.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3092766a-822a-4a5b-bc2e-71ecd49fd715/rugudinodawobe.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/vogugotakotitel.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_off0000f43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43B 5412 bytes
SHA-256: 50d0a5bb177900c1ad29d7d83225b47d258cecd4979c6c7afbf4311436a728af
font_01_sfnt_off000106c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C9 11468 bytes
SHA-256: f5fd3ef11a8c130f421489164e6863e88302bd64d7afcd9b2f2e6cf02a7d8330