Malicious PDF — malware analysis report

Static analysis result for SHA-256 868ef579deeb1af0…

MALICIOUS

PDF

81.3 KB Created: 2021-05-20 12:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7d13c6d4d95533dca4843f494b81d6e6 SHA-1: 2abc0415fbf59d450527d2b6fc53b9cdfa496b09 SHA-256: 868ef579deeb1af074f618dd94ab41964de8814c871156f4922b7b0b393a83b9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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://jottigo.ru/strik?utm_term=%25C3%25A9valuation+frise+chronologique+ce2 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460966/normal_5ff13a6ab9ca2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384839/normal_60379f8a1aa23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452850/normal_601b8b50d54e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379731/normal_5fcb155a8ce32.pdfIn PDF document text
    • https://zanebereraba.weebly.com/uploads/1/3/4/4/134472179/mokagoxosotakobesola.pdfIn PDF document text
    • https://xezitolisaja.weebly.com/uploads/1/3/1/4/131406502/bafigij-bixosozukirapo-ximojevode.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/plan_de_estudio_de_la_biblia_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/kurefoxuzuwovobigusaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/326b1b50-178e-4cae-9ffd-0406a7608f07/cant_use_charcoal_pine_resin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/942db1de-082b-402c-9a64-b9e9671e29cb/refovo.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/que_es_crystal_reports_runtime.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/saddle_hunting_platform.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/blank_cheat_sheet_template_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4af55ac-c4f1-4b24-8e9b-5113d1872d80/sagovejabul.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/what_is_exercising_parental_authority_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbe5b431-bc8a-4cc0-a2af-905b6bd44ace/vojigedikamemejolijusu.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/what_is_mitotic_spindle_in_biology.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/fafabibefolusexaz.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/vutibutoxuwuna.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/what_is_considered_a_package_usps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55e9b13e-cfdc-4302-8daa-40e462649794/imaginarium_city_train_set_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/venaxinebonozodajukutose.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D0 5440 bytes
SHA-256: d1b682c13f746649a97c0e4ba419af69c61d48e6a4d2af4cc5ae2507d4678711
font_01_sfnt_off0000f75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75E 12256 bytes
SHA-256: 6cb869cab27271b75f39d0434c16984f85ecf68a4930bf904fedbdf056df93e0
font_02_sfnt_off00011f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F64 16312 bytes
SHA-256: b2563e85233037e3c2780690ed1455257f868516b5a962e54e6ffe29314c9cb1

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