Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d6602ee025462f…

MALICIOUS

PDF

99.9 KB Created: 2021-03-22 21:03:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 42112fba18231b87c0fbb20e7f724fe7 SHA-1: 26816646096a27f5e01e18a257795bbf32964cd0 SHA-256: b5d6602ee025462f78bc330c19a5e5b7b08662d806a90be439b25c6d641496d9
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains multiple embedded URLs, with one prominent URL pointing to 'kuzutuzo.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains keywords related to 'Cours energie biomasse pdf' and 'wkhtmltopdf', indicating a lure to disguise the malicious nature. The presence of numerous links, some on disposable hosting, further supports a link farm or phishing scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=cours+energie+biomasse+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401697/normal_5fe868a4b25ee.pdfIn PDF document text
    • http://lanasobewusek.22web.org/35612651425.pdfIn PDF document text
    • http://jovasetiveduza.scienceontheweb.net/87898619467.pdfIn PDF document text
    • http://nawitebexu.medianewsonline.com/zambian_biology_syllabus.pdfIn PDF document text
    • http://mezogevap.mypressonline.com/2738539266.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475987/normal_603182fb13c6d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lomolawowetaxu.rf.gd/98553275561.pdfIn PDF document text
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_eacc42aad8114c98a0d9d759e71215c7.pdf?index=trueIn PDF document text
    • http://majojevonomofu.rf.gd/canales_de_comunicacion_interna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2141708-6c07-4afa-8ba4-e9e1b0e9e4d8/5437739080.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83182fb5-c6bb-4185-807f-94c0eeda055b/desijosenaxukowudareg.pdfIn PDF document text
    • http://mijikabetabup.rf.gd/what_caused_the_civil_war_dbq_documents.pdfIn PDF document text
    • http://wamovesomawegun.rf.gd/18971932947.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccd3b1d7-28d3-4c77-bc46-0898a1079ddc/intuit_mint_hide_transactions.pdfIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_7c128f6e17a64c15a5e60b7596da6814.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/minabiwa/61001340188.pdfIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_9c284b0f120e403b8f57b92745f55782.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/bisowetuwexuwubumemo.pdfIn PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_26b40ebc1c924bf3b45aab37f7bb21f1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/13273a4e-917c-412d-a556-0f5016447144/zawak.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/rusoxeku.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/integrated_reporting_framework_nz.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_off00014432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14432 5376 bytes
SHA-256: 3dddce3443ee85c5d3e53fb6dbe54960f1f5bc5679cff4973956f26e5187e8ee
font_01_sfnt_off00015658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15658 13504 bytes
SHA-256: ba5382a47179324d0262c4940b8fbff5f0035b8f5dc9480f03ee43c0b6eb248e

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