Malicious PDF — malware analysis report

Static analysis result for SHA-256 a948601b58f8a953…

MALICIOUS

PDF

81.6 KB Created: 2021-04-01 01:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 379fc633fa1b8fa107aa1b3fdd2cf820 SHA-1: 52744f680b82e8c082171b82cb2326507992b1e2 SHA-256: a948601b58f8a9533bf998d7c66cf4868cebfe1ffdc489aab8ee80c4b5df0846
126 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, containing numerous external links, many of which point to disposable hosting. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the presence of embedded URLs and the link farm structure suggest the document's purpose is to redirect users to potentially malicious or deceptive content, possibly for SEO manipulation or to host further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/wix?keyword=miniclasix+bathing+suit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403683/normal_600e1f49c2375.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379960/normal_601e4ade62a95.pdfIn PDF document text
    • https://zewabezasakaru.weebly.com/uploads/1/3/4/5/134593707/kajepizexov_navab_figitor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411511/normal_600204df5bed6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384144/normal_5ff30d36d3054.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413567/normal_60470dfd344ce.pdfIn PDF document text
    • http://dovulup.iblogger.org/hotstar_for_pc_windows_7.pdfIn PDF document text
    • https://sidilatadafexu.weebly.com/uploads/1/3/1/1/131164021/5fac3b9a3d1145.pdfIn PDF document text
    • https://xilizotuxepaxi.weebly.com/uploads/1/3/4/3/134309236/268717.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sujotoginejo.rf.gd/jexiwug.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/how_to_trade_options_for_beginners.pdfIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_c8d95c9888b0413eab25d26ecec84c46.pdf?index=trueIn PDF document text
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_19ab128765614ba38224db0e422a9014.pdf?index=trueIn PDF document text
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_dbf5ace95cf740e8a2a16b29638937e2.pdf?index=trueIn PDF document text
    • http://zopatirek.epizy.com/6929298976.pdfIn PDF document text
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_b0dde6c61d944b41858e59101ec36998.pdf?index=trueIn PDF document text
    • https://9480ebe7-8096-4165-94d5-b35dd525e9f4.filesusr.com/ugd/07b43d_062d828af1dc49e18ede7a1c13727ab2.pdf?index=trueIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_a5956ed9b62d47328affe1f5b7bd93e6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/love_yourself_answer_concept_photos_e_version.pdfIn PDF document text
    • https://a0a5ada1-270c-452f-b092-d943fc6f0dc0.filesusr.com/ugd/306762_f20fc1b3a530497e8b22dee70fdab252.pdf?index=trueIn PDF document text
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_00eec3843f664e028362a8596fea513a.pdf?index=trueIn 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_off00010271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10271 5180 bytes
SHA-256: a66ae1f2c0e26179e73495c6f5392726820af375156c7f88bfd0fa85a67020b1
font_01_sfnt_off00011420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11420 10820 bytes
SHA-256: 0e00ba8fc5d11c6b82f4e272c42aabd0a1f01e82849a6e577a68845a0cdd3969