Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1b281ae0622cba…

MALICIOUS

PDF

77.6 KB Created: 2021-04-22 10:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 1c9ccecd8c537fccb0e21e2f9a0ed9c2 SHA-1: dbbf5483f398ad8c570de9fc06759104f67992da SHA-256: da1b281ae0622cba476b02c749352f5b08d7b5f4c78563614e4358ec792ef6f8
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that leads to a suspicious domain, identified by ClamAV as a phishing trojan. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to 'contract law basics', suggesting a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=contract+law+basics PDF link annotation
    • https://cdn.sqhk.co/gapirofi/wijiiHo/69908158293.pdfIn PDF document text
    • http://babysampler.com/menuxufusumuzsm2.pdfIn PDF document text
    • https://cdn.sqhk.co/ronofumito/5sxrSlL/japopasusago.pdfIn PDF document text
    • http://hookup682.site/pubunigagadigiwip0ra4s.pdfIn PDF document text
    • http://zomixuxoluzijum.mywebcommunity.org/tratado_de_auriculoterapia_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/0iciggd/siege_hero_wizards_1-_60.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/banula/assessment_and_evaluation_in_higher_education.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/did_saitama_kill_garou.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/anamika_songs_pk_free.pdfIn PDF document text
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_61b36fead570471d8783372f9882180b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/doxifuba/67479553526.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/60045187438.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/cursive_joined_handwriting_worksheets.pdfIn PDF document text
    • http://fojakosi.atwebpages.com/dependency_theory_and_underdevelopment_in_africa.pdfIn PDF document text
    • https://05790d5e-93e9-4545-bcc4-99c37f081c18.filesusr.com/ugd/bff4d5_9aef48ae0cee42acbc6a933ebec8f12f.pdf?index=trueIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_59496e366c95448aa0f8beaef83fb9b1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/68811595676.pdfIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_1f9471105ca243a88847d489bfbf73f0.pdf?index=trueIn PDF document text
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_82dd7681bca44aacb824e428db0e870b.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_off0000f47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47B 4932 bytes
SHA-256: 91d92a65b34fca8e82d4ded92d275e947f8c8670c81d3616930968b26e6c3e05
font_01_sfnt_off00010558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10558 10500 bytes
SHA-256: eb6056f02a5ac5f9ea30e8c12447a032acbedfb92230f42b8f9a6b7183eaf7f6

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