Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc668fd341916a4…

MALICIOUS

PDF

66.8 KB Created: 2020-12-14 07:37:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: c6c890987d0030fdbcdc1f4fbcbfd3ea SHA-1: 2cf756f25e97a7f4aa95b8af8b4cbf885c0bcb7d SHA-256: 4fc668fd341916a451239ed08f2e5c3a3d69cd0cfa06fbabdd581a26eb0df636
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though heavily obfuscated, appears to relate to an 'Electrolytic capacitor polarity test', suggesting a lure to disguise the malicious intent.

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://traffine.ru/strik?utm_term=electrolytic+capacitor+polarity+test PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482399/normal_5fb586c2cadd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385021/normal_5faf8ac811fba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500189/normal_5fc2c43f622d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5f8c4d46dd7aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409409/normal_5fd17c78acea9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383460/normal_5fb7e705507f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499999/normal_5faf6baca248a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446395/normal_5fa439cb3a1eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371553/normal_5f9049f8c8695.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc525840b6b03258f50f531/t/5fcc527f6f0099009e58fc5c/1607225983947/starfall_numbers_learn_to_count_with_train.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac9d4b02-6a90-46ee-8171-ad0a7f4fdaee/letixapazamut.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/mariage_d_amour_guitar_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c83d990-5f78-4ec9-81c4-99e3e7c60933/relationship_between_structure_and_function_in_an_organism.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0028ac14dfd36feec75cc/t/5fc137b7f3de5e49b590d423/1606498231156/nfl_teams_map_usa.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_off0000c9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F6 4984 bytes
SHA-256: ab81510d4e8e3b2162c0dd4e6b8e8da4a43b2508d545df5ef33aef841ae46eb3
font_01_sfnt_off0000db06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB06 10332 bytes
SHA-256: 9b99683ca75c3b1d72da2eaabf32935d29851d58b88e729c80535dccf3cf1be4

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