Malicious PDF — malware analysis report

Static analysis result for SHA-256 b194d64d2297c785…

MALICIOUS

PDF

75.8 KB Created: 2021-02-18 23:26:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 07414b9b999bcbd79fedd0456f9ac1ff SHA-1: 529e7a0c1f51b0a6bebc6f0e34bc10cf8d7d5525 SHA-256: b194d64d2297c78537d06b3befc559883a48290551894af90ae0675d64240e73
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. The document body, though heavily obfuscated, appears to be a lure related to a book summary. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitated the embedding of the malicious URI.

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/strik?utm_term=resumen+del+libro+cronica+de+una+muerte+anunciada+capitulo+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374957/normal_60291de39c74d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473056/normal_60270b6c0cf45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426073/normal_5fd09d7294e87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474720/normal_600c79a21e926.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445326/normal_5feb4e961c2b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453134/normal_602cb588b3151.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445889/normal_601a714b56398.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407066/normal_5fcb504eb9708.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421611/normal_5fc900619d1e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374376/normal_5feb95c6745b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380214/normal_60051241207cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486566/normal_5fdae22e8ca1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415930/normal_5feee3b06ad46.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gitipelut/create_personal_email_template_in_salesforce.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/journey_to_the_west_cast_korean.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/74814912038.pdfIn PDF document text
    • http://weregubitirab.rf.gd/concerto_for_two_violins_vivaldi_sheet_music.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_off0000dc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3E 5380 bytes
SHA-256: 169c4f2c253c7817c818878a51436084d3b97a9833cb6d9b26bcc078fd7be72e
font_01_sfnt_off0000ee59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE59 10900 bytes
SHA-256: 3900003042e459afc79bbcf26c0146ace7c143b35163aa3dc23256c21b1bef9a
font_02_sfnt_off000111a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A8 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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