Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f62db64ba441c40…

MALICIOUS

PDF

74.4 KB Created: 2020-12-15 14:05:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 225674a39222bf61c2e771c818314ba8 SHA-1: d99c9d2cf985bc327bc64664c8dad0b34c49fbe8 SHA-256: 5f62db64ba441c4085f7b6e93da403a9d65d472292da577b280a23e1284bf122
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/strik?utm_term=backgammon+rules+printable PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382618/normal_5fb302c134b8c.pdfIn PDF document text
    • https://zorivaleguzovul.weebly.com/uploads/1/3/4/5/134596353/52c82a35dc3d5.pdfIn PDF document text
    • https://zuforupixonop.weebly.com/uploads/1/3/4/3/134394080/mevixes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447089/normal_5fa78bd846298.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403672/normal_5fd177274f4c2.pdfIn PDF document text
    • https://tubomomumaxef.weebly.com/uploads/1/3/4/5/134508744/3473370.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402944/normal_5fc75f4ce0e1f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a9025d8d-1431-4548-9414-4b0038a11f03/7-3_skills_practice_similar_triangles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ed254dd-5c80-428e-8f47-9f474f023f03/amcat_mock_test_papers_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21055134-f47d-4265-b5d3-e2273aafbb2c/brown_eyes_color_wheel.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5797f6b97992eb57a8de3/t/5fcbd55a7ab0f364abb748b2/1607193948848/sesimakesu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/506dbc1c-963e-44d3-bea6-7b01f6ff8ddb/89624922039.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE4 5388 bytes
SHA-256: e37d3ef71d5e196a983f9e1a8864f9156997de7c1aeb31837e876a0d86a29558
font_01_sfnt_off0000ed1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 9844 bytes
SHA-256: 759292d270f70b7b074648f1819f3546f2a8691bf4c09f7d311f28ed21f565d4
font_02_sfnt_off00010ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED9 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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