Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb1f8b2dc2c0fa42…

MALICIOUS

PDF

63.4 KB Created: 2021-01-08 18:15:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 1ff8019b0dc3883f40045308e3dc6909 SHA-1: 227c827ecafbdb7d608f090eb979630a75ca1542 SHA-256: eb1f8b2dc2c0fa4290d46dbcba21093c0092decd4ee15506a4be81fd5201c5b0
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'trafffe.ru', which is likely used to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to an educational worksheet.

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://trafffe.ru/aws?utm_term=expanded+noun+phrases+year+4+worksheet PDF link annotation
    • https://posuzelivoj.weebly.com/uploads/1/3/4/8/134869480/vikawozepukuwemak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379844/normal_5fa3e7d089ddb.pdfIn PDF document text
    • https://lemusovigezamo.weebly.com/uploads/1/3/1/3/131381045/nelekeboxozutaxubife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368956/normal_5f9d1efbed9b0.pdfIn PDF document text
    • https://cdn.sqhk.co/zodenizekija/qLZiaTX/my_server_port.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446030/normal_5fed6fe75bfcb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489732/normal_5fc85cfb81f81.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/zetubakuz/castor_informatique_rsultats_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6398c683-5087-4503-94ca-e7177e8073fb/jutukukejezajedujamo.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/acls_algorithm_2019_aha.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_off0000ba65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA65 5384 bytes
SHA-256: 9f583f2ade3d003c600a8551b039bd65aa4d21c0af38e99bbe933b7b77d346be
font_01_sfnt_off0000ccd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD2 10716 bytes
SHA-256: b6346a2d60386db163bfc94059aa6546a84a9b0153b2e71f443903ff2de30170

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