Malicious PDF — malware analysis report

Static analysis result for SHA-256 2caded0485643ed9…

MALICIOUS

PDF

77.7 KB Created: 2021-03-12 12:00:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0a07e6a55b0d4f1afd67ba5b186c7b07 SHA-1: d8bb6786c9f10f4d7f8e38549e417b7ce4e72e7f SHA-256: 2caded0485643ed9cd3e4a3fa538dff9678dc7ec3d57bacd1cfda790eb0cfbe1
126 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://kuzutuzo.ru/award?keyword=automobile+bill+of+sale+florida+pdf', is presented in a context that mimics a bill of sale, likely to deceive users into clicking through to potentially malicious content. No scripts were extracted, but the heuristic firings strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/award?keyword=automobile+bill+of+sale+florida+pdf PDF link annotation
    • https://mefosenide.weebly.com/uploads/1/3/4/7/134715399/2584511.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/Mjjjeie/lockdown_house_party_mixtape_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/rarirawibowo/ggn8xgg/tactical_battle_simulator_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tonufipu/cAyycji/99969532863.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423428/normal_5fec406cb8e45.pdfIn PDF document text
    • https://cdn.sqhk.co/ninulekuto/hhhdpBY/indycar_schedule_wiki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453553/normal_5ffaf2144a182.pdfIn PDF document text
    • https://sabalijazot.weebly.com/uploads/1/3/2/6/132695986/dd07f544df7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384647/normal_6041804388958.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496602/normal_6012cdb244758.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497372/normal_604aca567aa7c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_ad18e99d238c4c4290d40649a47f96e2.pdf?index=trueIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_0cca93e9eeb74703a2683a5d0f94a878.pdf?index=trueIn PDF document text
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_8ca8080e02c149f5898c033f64e4aac8.pdf?index=trueIn PDF document text
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_e956c85436714b7e8d4a5ef3be86f020.pdf?index=trueIn PDF document text
    • https://459fb65c-52af-4c88-885a-43a44fbeaf25.filesusr.com/ugd/6a7407_51a48cb737344b1e86ff5901352fe6d4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d0bc295-f64d-4d0f-93ca-bc37907f20e2/what_is_an_internal_control_in_auditing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3f9bcaf-c060-41f5-966a-c02c9f37e51d/shark_navigator_deluxe_nv41_parts.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_off0000f3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AA 5316 bytes
SHA-256: 6e67afa3ffd949c9fc2fbba6ebf8d4057be43514324ddd8db85179cb95370252
font_01_sfnt_off0001059b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059B 10420 bytes
SHA-256: f212de359af39243cdd5a2b1f819f6996dcbcc6bcdb8b7b7ed353618abe8da20

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