Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c5b52c466b93d1b…

MALICIOUS

PDF

77.9 KB Created: 2021-04-03 00:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5cc32d7ebad4964e92a8d0d624f5a23b SHA-1: e9e587b58c633a8c47916e7f628183c8bfc2dcd3 SHA-256: 1c5b52c466b93d1b7ef3788e74181884161a2d554243d04eafe50eea8356ddee
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier strongly flagged this PDF as malicious, indicating it likely exploits PDF vulnerabilities or uses social engineering to redirect users to malicious sites. While no scripts were directly extracted, the presence of external URIs and the link farm heuristic suggest an attempt to download or redirect to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://baarspo.ru/award?keyword=animated+gif+in+pdf+document PDF link annotation
    • http://gemajesubon.22web.org/66190718548.pdfIn PDF document text
    • https://cdn.sqhk.co/kojuzipag/jigdgeZ/spades_card_game_rules.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369163/normal_601a7419eea3d.pdfIn PDF document text
    • https://cdn.sqhk.co/puzonexus/giBsVja/dobikavupuvetifixepos.pdfIn PDF document text
    • http://vamolufu.getenjoyment.net/synonyms_worksheet_grade_2.pdfIn PDF document text
    • http://tulavesew.getenjoyment.net/booklet_printing_template.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/DBpgdjg/4827024334.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376852/normal_604853b1e5eb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391623/normal_6050eb7f12b91.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/hg15xjg/raven_night_mod_apkpure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369643/normal_602071333f899.pdfIn PDF document text
    • https://cdn.sqhk.co/lokiwejawe/eIirhbi/97809961654.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duxuramubot.epizy.com/16046416101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1df6fae3-e59e-41db-92aa-47f32298dbdb/60331176668.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/81091598888.pdfIn PDF document text
    • http://wedimotonolisu.rf.gd/27779087398.pdfIn PDF document text
    • http://losagamadupo.rf.gd/yacht_crew_salary_guide_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a852ba8-2e6d-4aac-b50f-afbbce6cb0a2/battery_tender_waterproof_800_ma_12_volt.pdfIn PDF document text
    • http://lumosaneja.onlinewebshop.net/rabosimiputu.pdfIn PDF document text
    • http://nuzoniwetavo.rf.gd/encyclopedia_career_book_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/59039133602.pdfIn PDF document text
    • http://duwemanuwixam.atwebpages.com/races_warcraft_2.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_off0000f350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF350 5156 bytes
SHA-256: c274b554b014775da329ff2853b76163ee217044423c8446882397704d13c418
font_01_sfnt_off000104d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D9 11060 bytes
SHA-256: 575c54a460925533c6b5a1e129c8160fcca4d76f9488fb43080036f9225d68f4

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