Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f5adc026e19f6e…

MALICIOUS

PDF

47.5 KB Created: 2020-11-09 14:59:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: 0a56fb00ea8a8aff334434c77656d627 SHA-1: 00c5abdf12d5afa7cd3d908190abd975a261f2ab SHA-256: c5f5adc026e19f6e4b3d7f10d0903016e3b70e0e0d5d657e2aeec62ae9f06237
136 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/123?keyword=top+ultrawide+monitors+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376600/normal_5f908c67484e2.pdfIn PDF document text
    • https://xomowapiwaliv.weebly.com/uploads/1/3/4/0/134000086/wefoli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413842/normal_5fa2b6375774f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367680/normal_5f88663b589f2.pdfIn PDF document text
    • https://fobaripiso.weebly.com/uploads/1/3/4/4/134443650/vijorubelowodo-zonuwazedenup.pdfIn PDF document text
    • https://vibebivenef.weebly.com/uploads/1/3/1/4/131412032/zewija.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/b1086f3f-c32d-497f-b39a-730bdbe512a2/36249198282.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4330785c-dacb-4589-8579-1253ad349910/prisma_pentagonal_formula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93d4fbf8-99ee-4b8e-8e2c-e8a07f131ded/5285268127.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3100d62e-99a4-4a7c-879a-d6b2a7e575a9/materiales_de_aluminio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0701e26e-9f3f-4caa-880d-8b1d9a0e8e44/vonumazet.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_off00006db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB0 5300 bytes
SHA-256: 2d64c1aa50d5a1803fefc57c58088133e0d88a63597ef7bb85f6771f3ac1256b
font_01_sfnt_off00007fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FAB 10548 bytes
SHA-256: c0d6467898e7d42fe3bae429faa7563d1242e283af997fe40ee4b3f224723de0
font_02_sfnt_off0000a374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA374 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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