Malicious PDF — malware analysis report

Static analysis result for SHA-256 c59bf9c3dfc2ab03…

MALICIOUS

PDF

150.1 KB Created: 2021-06-01 12:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d1bae32f5cc99bb8ce6201aadbe3ab4d SHA-1: 5edaa177a8a210c86d8dc31c713f979799f22c87 SHA-256: c59bf9c3dfc2ab037056544ab64a5104c5c33109c318ceb9caaac093da792760
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a malicious domain, likely to deliver a phishing or malware payload. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to academic problem statements.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://laborke.ru/pbw?utm_term=ejemplo+de+planteamiento+del+problema+cualitativo PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454824/normal_602ad9e69d698.pdfIn PDF document text
    • https://dubiroki.weebly.com/uploads/1/3/1/4/131483307/63499228d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374953/normal_5ffe1c69d4744.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368999/normal_6008760671fe9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494166/normal_5fdd33d532971.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456676/normal_605a606a2e703.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415080/normal_5fdebdc5e7dab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465131/normal_605370b4be6e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419002/normal_6045f4743017b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494430/normal_602f709e290ff.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4461509/normal_60afe6b608927.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379723/normal_5fc753f145c17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448551/normal_60590f22c329f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498868/normal_5ff389805dc5e.pdfIn PDF document text
    • https://muvanuxeb.weebly.com/uploads/1/3/4/0/134096654/dajan-pelolug.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4427097/normal_60b37889a544f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443804/normal_606504f7726b6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wepoline.pbworks.com/w/file/fetch/144449832/majuvom.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/w/file/fetch/144436347/twilight_saga_2008_tamil_dubbed_movie_download_tamilrockers.pdfIn PDF document text
    • http://xedidovetaw.pbworks.com/f/15046864743.pdfIn PDF document text
    • http://sepaxebi.pbworks.com/w/file/fetch/144414048/negowujuxuxenarapageveza.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_off00020df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20DF6 5276 bytes
SHA-256: e252fc2d6bf1b3df2dbe926fe327e30554a40b5fc9a4fdb112f6b5570ab06a52
font_01_sfnt_off00021fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21FD4 12684 bytes
SHA-256: bc69085614570f414a9e4d01d626fb091a84e45faf0edfb2c80944a111591161

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