Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ee8809d2c38b18…

MALICIOUS

PDF

71.9 KB Created: 2021-03-01 16:39:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 33b6da0714e84819cb85b73ea037c1ad SHA-1: 2ec50473a20b34cd1c8c91a4b45fac9a10ea77f1 SHA-256: 54ee8809d2c38b18e0d6bf9999a6fdb209ba52d7cac9cdae15d90e929bf3655d
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 as a 'PDF_SEO_LINK_FARM' heuristic. The primary external URI points to 'https://bologen.ru/wix?keyword=kuru+kuru+sushi+menu', suggesting a potential phishing or malicious content redirection scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the structure indicates a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=kuru+kuru+sushi+menu PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4455658/normal_5feea4413ffc0.pdfIn PDF document text
    • https://levapexufusetij.weebly.com/uploads/1/3/4/9/134904519/wepurunazo_pozawinev_turugu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426572/normal_60035034a4de0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407576/normal_602748f4ae0bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476288/normal_602195131fbdf.pdfIn PDF document text
    • https://pefobasor.weebly.com/uploads/1/3/4/1/134131397/4caaa842fde6fee.pdfIn PDF document text
    • https://bizavewes.weebly.com/uploads/1/3/5/3/135323934/niniz-jupirivejepo-vilirafarenek.pdfIn PDF document text
    • https://vasejafarobi.weebly.com/uploads/1/3/1/4/131454155/0e541.pdfIn PDF document text
    • https://tesewipelevifiv.weebly.com/uploads/1/3/3/9/133997178/fd4e7e6379ad8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449990/normal_6004de4990ccb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410695/normal_601f2196d5fb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420924/normal_5fc758680aaf7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366980/normal_5ffbd31cf25e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416659/normal_60023d2f628aa.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/sazixipame/public_finance_notes_kenya.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/how_to_make_a_vocabulary_quiz.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/36183918374.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/home_loan_emi_calculator_in_excel_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/46079189920.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_off0000cf0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0E 4716 bytes
SHA-256: af3cdf616d2117a445e0403326dd9466e48055fbca4c3a3e810b8a6dd569eb81
font_01_sfnt_off0000deec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEC 16580 bytes
SHA-256: 3f8b2a78e7aa2ee997aa3363966430c1fc5c54f7748a40acec45c10b7e78f115

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