Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7359d8693c24826…

MALICIOUS

PDF

71.3 KB Created: 2020-11-24 12:03:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3b1d00de02fb02071bb2087092f5e87d SHA-1: 7876173db2f332154f67e3c24fb1f02ff349f900 SHA-256: d7359d8693c24826e6e88ec38a7cbf3d3d67febf7d36ffc62102ea9a97d587e8
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document is designed to redirect users to potentially harmful websites.

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://trafftec.ru/strik?utm_term=old+man+logan+cbr+espa%25C3%25B1ol+descargar PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410953/normal_5f9e89b0604cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389353/normal_5f9d4dd2ae96d.pdfIn PDF document text
    • https://folemazilepi.weebly.com/uploads/1/3/1/1/131164248/begijof_puwefoluxib_rinutolij.pdfIn PDF document text
    • https://zasiranel.weebly.com/uploads/1/3/4/5/134507270/nakunadale-teziwagesopeg.pdfIn PDF document text
    • https://joxetoxuluf.weebly.com/uploads/1/3/4/3/134391367/vaxamakuso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366989/normal_5fb4ff324d0fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413119/normal_5f9590592caea.pdfIn PDF document text
    • https://sebiwijojemobod.weebly.com/uploads/1/3/4/0/134097571/wimaguve-tagadopajaz-zitebafa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467571/normal_5fa2f925d74c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383804/normal_5faa209796ab6.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/5ded892c-86ff-40bb-a20b-153e6a33cef2/igreja_quadrangular_missionaria_adri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bacc8287-b03c-46b4-b135-29ae8deaad11/22504632981.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d7ea801-dd85-4aea-979e-dc2388b81b88/fegeluturinowibisewivil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfb2f3f9-a7b9-41d0-9687-fb77d2887fd2/godinger_jewelry_box_1991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28a5ad68-99a0-4872-bdf8-4e824cc94f38/pexabipevev.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
stream_003_off0000db9a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDB9A 10616 bytes
SHA-256: 3a224cb8edcbf00655836260f9f5b8c1a79fd5d03de7666b8e9c34dc782300b0
font_00_sfnt_off0000c993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC993 5432 bytes
SHA-256: 4a33e038d3a46624822cdcc81ed14facbb5d0c807bacf89d4a6037ef76939235
font_02_sfnt_off00010008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10008 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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