Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ed30bb14a32d13…

MALICIOUS

PDF

77.3 KB Created: 2021-04-03 18:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: edb5e1e01d53f4e31d53c05049597363 SHA-1: 49ed4c873e86b4eca8c1dfdea123efc685919797 SHA-256: 43ed30bb14a32d13099ccd6ced292821824b20b21bac018dbe4d2fbbc396dad4
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, with one prominent link pointing to 'https://kuzutuzo.ru/strik'. This URL is likely malicious, as indicated by the ClamAV detection and ML classifier flagging the PDF as malicious. The document body is heavily obfuscated, but the presence of numerous external links suggests an attempt to direct users to potentially harmful content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=the+high+republic+star+wars+show PDF link annotation
    • https://rapofureduf.weebly.com/uploads/1/3/1/1/131164295/6e6d1b5238a967.pdfIn PDF document text
    • https://kopusinuzek.weebly.com/uploads/1/3/4/1/134131929/ea129c319be104e.pdfIn PDF document text
    • https://maxazokal.weebly.com/uploads/1/3/1/6/131606281/1575962.pdfIn PDF document text
    • https://latiratigu.weebly.com/uploads/1/3/1/1/131164156/5305368.pdfIn PDF document text
    • http://liketsven.xyz/fasogaluzivog583.pdfIn PDF document text
    • http://erogan24.website/vepezafglq4d.pdfIn PDF document text
    • http://idealica-tufficiale.website/hp_laserjet_p2015_disassembly_manual27au6.pdfIn PDF document text
    • http://fakts.design/76568439403u0ngc.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/6d74a26c-7c37-4af4-ba7e-d8b5d34c44e3/division_properties_of_exponents_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e170a37b-189d-4697-a560-55c6247ed6ee/what_is_organizational_culture_-_definition__characteristics.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/kizaxave.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/norubovulagefujapapi.pdfIn PDF document text
    • https://abf133a7-37c0-4616-b653-d99fd306bce3.filesusr.com/ugd/5c8236_5c54b6352a8b42faa3d9f152686069d3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/67484353821.pdfIn PDF document text
    • https://f1801c53-b3f5-4b94-a9b3-4bb8eb376a66.filesusr.com/ugd/af633f_1bc6218f514f497ab52015f0e3b5c2fc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/penale/charisma_and_transformational_leaders.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b64c9f7c-fd04-4cfd-b7ad-ae44d18cd447/83846483192.pdfIn PDF document text
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_872cd8e1841b47ec8e875001eb8115cd.pdf?index=trueIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_edabc8a31eb4413797f6c2d1faceed35.pdf?index=trueIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_95edaeab00f84be6b11683ca9143207c.pdf?index=trueIn PDF document text
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_a44f81579c15416ca87dab2f3109d69f.pdf?index=trueIn 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_off0000f0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DA 5376 bytes
SHA-256: 42f663d24d818c638bbcf8b33575880862d3b66bb8a5507888bac7fa29c97172
font_01_sfnt_off0001032e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032E 10648 bytes
SHA-256: 1326bf570e157f0fd2643fa290a4ec5aa8d02c3d480d8d7f720fe4dedcfdda51

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