Malicious PDF — malware analysis report

Static analysis result for SHA-256 1437851b0124edbf…

MALICIOUS

PDF

65.9 KB Created: 2020-11-18 01:02:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9ac46c20e093a0d62b0702cb83239d9a SHA-1: 11172e743b128b9886f7eec0e97e99bc31701639 SHA-256: 1437851b0124edbfcc8f26d1027f13026675db1ac831e5ca41698d8e0cfe9f03
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-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://trafffe.ru/123?utm_term=flintstone+slot+machine+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385010/normal_5f9af8fa6e97d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458161/normal_5faf9f9764fd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_5f889d0b62f7e.pdfIn PDF document text
    • https://leruzifu.weebly.com/uploads/1/3/2/3/132302941/piwatajumisu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420610/normal_5fa7f3bc86862.pdfIn PDF document text
    • https://nipotowolexitav.weebly.com/uploads/1/3/4/6/134639117/5710030.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377909/normal_5f8f29ef00ede.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/a63fb.pdfIn PDF document text
    • https://tuxonojetivap.weebly.com/uploads/1/3/4/4/134437157/kejigajipelim-ramajibizabigis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/32c9a338-51f2-4b21-a51b-a14b18e9f24e/mmtci_racing_program_dividendazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba3f6676-3f53-4e75-b8f3-bee82997ac04/34242726576.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/zesinavebowam.pdfIn PDF document text
    • https://s3.amazonaws.com/nujosuwemedadi/go_math_grade_5_chapter_10_review.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_off0000c25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25E 5076 bytes
SHA-256: fe2ca22d29746256c4d99e0035ae5c61935fc6fc1c96c82ab10fe07941462bf9
font_01_sfnt_off0000d375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD375 11688 bytes
SHA-256: c98525edec81e7833e9d2a45229308497966bf8bd478e238a88d8ddc52e7350f

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