Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e341eca8cd1df6…

MALICIOUS

PDF

69.8 KB Created: 2020-11-18 23:43:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c1ee0f51aad41a0777f0a7a5e2a4304a SHA-1: ba063479ffacb0e925bca945ad60adcb3809498d SHA-256: 27e341eca8cd1df64928aafb7b2a7ce0d7d92fc098ef37429dfc14cceb4142c2
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 0.9997

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://traffset.ru/strik?utm_term=o+c%2525C3%2525B3digo+dos+homens+saraiva PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370767/normal_5f8c98db1617e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5f8776d260010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420431/normal_5f9e74aae87de.pdfIn PDF document text
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/mabuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372681/normal_5f9ee31813e8f.pdfIn PDF document text
    • https://pipomojum.weebly.com/uploads/1/3/4/4/134437532/pusav_xiguxul_buzapabogenat_mogiloli.pdfIn PDF document text
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/4789168.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/1db128a0-1e72-41db-9586-f416b2cd72cf/tonabebapukajitob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c698b85-5020-49a4-b7da-0610d44e7b06/myegy_games_pc_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73db3985-56db-4b9d-86b7-5bb9dc192a02/cub_scout_bear_handbook_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c64bbe0e-837c-4ac7-bc6d-9e33fe9e54ce/nabafoxupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7777d798-21ae-4b9b-a7b9-709cd3871ba9/nosumejipotavujazoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eaafac0-f7a6-4e6f-beab-fb74f53efce2/44593616746.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67bc0bf8-e158-4896-9dc7-50d7daee0ce0/introduccion_a_la_microeconomia_en_vietas.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_off0000d2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EE 5544 bytes
SHA-256: cd0953e9339e02af18f4bf170e162aacd07260dda13a745f19aa0f4a60e2ae66
font_01_sfnt_off0000e567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE567 10516 bytes
SHA-256: ff77f74af585cf34cd7343bdc018c0835621f8a4d63f9ca1819de16e91aea484

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