Malicious PDF — malware analysis report

Static analysis result for SHA-256 95fd97893f103113…

MALICIOUS

PDF

46.0 KB Created: 2020-11-08 13:30:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f32cb63407a11e4c1066ae7cfb52ec96 SHA-1: d86d16d0a27fbaad28b0ee3fdfbb1cb92684d7d4 SHA-256: 95fd97893f10311344d30fd9864ac30940dc01d4e71a7d9d1957dce8d15a2bf6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffking.ru/123?keyword=radiography+technician+resume PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366306/normal_5f87340bbf6db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446770/normal_5fa7824c2fc0b.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/576f3400-f098-4c8c-83c9-946eee18bcc3/26931473310.pdfIn PDF document text
    • https://zolikaf.files.wordpress.com/2020/11/la_cour_de_babel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e543a51f-3988-4acf-bce3-0d2187f4b4df/nasewawovumubekapusogo.pdfIn PDF document text
    • https://zatejoru847961968.files.wordpress.com/2020/11/72489844693.pdfIn PDF document text
    • https://wumevom.files.wordpress.com/2020/11/40769065943.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65a2673c-eab5-4fef-8d5d-b829c377e0b5/2685371324.pdfIn PDF document text
    • https://dizavixawir.files.wordpress.com/2020/11/daniel_cassany_construir_la_escritura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/941907e4-738e-4a8e-821e-24c2d2e2a1c6/zaxutenise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c2da7c4-179d-42ee-9c44-b8baeb6a8ad7/pakebevepe.pdfIn PDF document text
    • https://tazibala.files.wordpress.com/2020/11/4321034005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a18bb3a-3386-468f-82c5-bdd0882fdca6/rukejupozewureleka.pdfIn PDF document text
    • https://fozokulepuda.files.wordpress.com/2020/11/13429708101.pdfIn PDF document text
    • https://lalibakorex.files.wordpress.com/2020/11/7605550366.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85c185e4-322c-4a72-b824-dc70996e144d/dupog.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_off000064f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64F2 5444 bytes
SHA-256: 7c3392bddea863448615ef3bd3b00b9f3570aeeda1726c17d21273a303d8fe8f
font_01_sfnt_off00007754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7754 10988 bytes
SHA-256: 53826c8d608f633a3a0b1b3c73ff4b3de350b8ded8d0ce1ea2453e5e0c0aefa7
font_02_sfnt_off00009cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CF4 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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