Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0849fdc832597fd…

MALICIOUS

PDF

73.2 KB Created: 2020-11-16 22:18:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fb767f41ad4e67509ebafd3894d43140 SHA-1: 199987cff6935c0e36e106d884bef4d77f7ad53e SHA-256: b0849fdc832597fd7f64f312c082e936f3c9e2c667a131302fe3bf46c2c772fe
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of numerous external URLs points towards a potential drive-by download or phishing campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafftec.ru/123?utm_term=bluebeard+short+story PDF link annotation
    • https://zufugorutamivas.weebly.com/uploads/1/3/4/4/134401118/zadiduv_jimegobuvizofe_rowojiz_jalojitibixa.pdfIn PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/bakewim-fubejinawonunu-nifemaguzawev.pdfIn PDF document text
    • https://radetotoko.weebly.com/uploads/1/3/4/6/134697609/xijan_wemimibadok.pdfIn PDF document text
    • https://melegejisud.weebly.com/uploads/1/3/1/3/131379421/d913fd4bfeed3.pdfIn PDF document text
    • https://naxibozagut.weebly.com/uploads/1/3/4/5/134580084/2594328.pdfIn PDF document text
    • https://dikabapor.weebly.com/uploads/1/3/4/6/134620412/a4b4b95ff82f.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/e1e52385-0c36-4e11-a22a-7ccf69e4aeb0/banovomifakapojuxuxel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c94c1f2-5218-41e8-a0ed-047f5895f9e6/animistic_thinking_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/22536695153.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/2018_teachers_convention_nj.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/sepebilibugulabukoruz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0396a8b0-ef04-496b-8b20-7e8869adac23/46595128581.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/mizotivanuzama.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_off0000e274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE274 5204 bytes
SHA-256: 95b44618bd857102fbe437c41f825ddc2a1895849f11976b52ca8c11cb84d070
font_01_sfnt_off0000f41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41F 10876 bytes
SHA-256: adb2013fc9e0e9186ce88fe956d1da98b742cd389aeaea08b13728a0ba4bf2a6

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