Malicious PDF — malware analysis report

Static analysis result for SHA-256 f566df06f9ae03d8…

MALICIOUS

PDF

70.3 KB Created: 2021-03-16 05:59:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 91795ad0547653e9bcc02d473c9d24be SHA-1: 249bc0c8041dc6ebfd2da307de799164a9d05b59 SHA-256: f566df06f9ae03d87d4a57f9ba92e877f1b4bc9a5ff12d70e87e4673c8ef7ea8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier also strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be related to search keywords, reinforcing the lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/award?keyword=benim+hocam+co%25C4%259Frafya+konu+anlat%25C4%25B1m%25C4%25B1+2020+pdf PDF link annotation
    • https://gilasagajeradek.weebly.com/uploads/1/3/4/6/134632792/2708843.pdfIn PDF document text
    • http://dokukuke.mypressonline.com/libro_defensa_fiscal_de_vanguardia.pdfIn PDF document text
    • http://marifivelaj.mygamesonline.org/6298909442.pdfIn PDF document text
    • http://sagedix.medianewsonline.com/kisuwubaropiripo.pdfIn PDF document text
    • http://wogivodugakovek.mygamesonline.org/xipivorozekufegotuli.pdfIn PDF document text
    • http://redofokotab.sportsontheweb.net/22028642524.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/jigobuzatodikivesaj.pdfIn PDF document text
    • https://gekubele.weebly.com/uploads/1/3/2/6/132683169/vukaremuko.pdfIn PDF document text
    • http://nituzovido.getenjoyment.net/vulixabefibured.pdfIn PDF document text
    • https://bewabolome.weebly.com/uploads/1/3/5/3/135347927/f2659f08490fa8.pdfIn PDF document text
    • http://pipavinekiga.mywebcommunity.org/deserafifebusatemovidame.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/vonutavekip/bopojupofa.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/arduino_esp8266_board_manager_url.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/what_is_a_democratic_citizen.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/bc_employment_standards_vacation_fact_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/azure_az-_203_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/macbeth_study_guide_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/bulb_smart_meter_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/30322256350.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/total_coliform_mpn_method.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_off0000cf07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF07 5968 bytes
SHA-256: 51c5f358eac350be99aebf46d2ede85124fb2596ef14c37059c156d47d3cac3c
font_01_sfnt_off0000e340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE340 12284 bytes
SHA-256: 371add2b92e66e366cd99f6782b67ab71f8e1f3d4e3a4c713159a6465c5b4447

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