Malicious PDF — malware analysis report

Static analysis result for SHA-256 779dad407e4b341b…

MALICIOUS

PDF

74.1 KB Created: 2021-03-20 04:54:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efa2a6ee464a3b399499b0116a55e945 SHA-1: 7be1df321876ab1d2157e881654182a09e4cd992 SHA-256: 779dad407e4b341bf97b585ebd0e6519da82429d5c255e785326740ed672b241
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain, identified by heuristics as an external URI and an embedded URL. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/wix?keyword=a+land+remembered+student+edition+study+guide
    • https://cdn-cms.f-static.net/uploads/4370280/normal_604ed91c2b4f1.pdf
    • https://static.s123-cdn-static.com/uploads/4384160/normal_5ffb746732739.pdf
    • https://cdn-cms.f-static.net/uploads/4456699/normal_6021c4e10d3db.pdf
    • https://cdn-cms.f-static.net/uploads/4414691/normal_605429224a0ee.pdf
    • http://creditpm.com/insinkerator_evolution_prestige_warranty5szyy.pdf
    • http://thesimplycompleteseries.com/fundamentals_of_financial_management_concise_7th_edition_solution_manualvx8m5.pdf
    • http://wiwajekirutiw.scienceontheweb.net/praying_for_your_husband_from_head_to_toe_ebook.pdf
    • http://luxshop21.site/fijojirisojewirilusavog7jua.pdf
    • http://interior.estate/35416696009w4gmt.pdf
    • https://cdn-cms.f-static.net/uploads/4408993/normal_60432227f0eef.pdf
    • http://somubuzesixuwun.getenjoyment.net/80754066527.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://77a5c3e7-429a-4f60-ad30-886abaef4f6e.filesusr.com/ugd/07a1ab_fcfbcecb607c41efba5895de5dba25fb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3700eeb5-4026-4aac-baec-fb7d9a6e5645/73737584252.pdf
    • https://uploads.strikinglycdn.com/files/510ec1ca-4369-41b1-9237-45f252c09ff7/kelanokavozisuginuruweke.pdf
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_e6b9c270599247eb9871108fd036115e.pdf?index=true
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_fe2e8f47d9584528ad4465e2674aa196.pdf?index=true
    • https://uploads.strikinglycdn.com/files/064c2537-1726-4060-8254-b13273e8dd69/vebasonamizajiratakuzuge.pdf
    • https://uploads.strikinglycdn.com/files/61f70020-31a2-409d-bdf7-858803b41766/98953226840.pdf
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_d6500195a12d453b9cfb6dfbc4d77e4c.pdf?index=true
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_4a55bd227f4b496b900c495815187497.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e502.bin
155ddeaa4e725f2680923b2b3a524217aead260d0ccfdabbbb4e4d07a263c593		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE502 5376 bytes
font_01_sfnt_off0000f738.bin
920678e34b34c9d24cdbb869619ecb3d56a3d71aecb514b7a7e88a34c12961b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 10540 bytes

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