Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd46c21373cefc8c…

MALICIOUS

PDF

76.5 KB Created: 2021-03-02 14:30:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 6f4cea312b03e107c0e76749f6c00a03 SHA-1: 224b40f34dcd0583df9caec2ef53de630d4fb47a SHA-256: cd46c21373cefc8c7c29b845e70aaf2ca1c08bd60939192f2f1acddb1c0def66
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be a lure related to 'how to work a country wood stove', suggesting a phishing or social engineering attempt to drive users to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=how+to+work+a+country+wood+stove PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403806/normal_5fe40ef77607c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473938/normal_5ff1d506ed081.pdfIn PDF document text
    • http://memisada.mygamesonline.org/pijas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369505/normal_602932d7bf27b.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/etc_smartfade_1248_lighting_console.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485572/normal_5fe9900fc1c56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392668/normal_600db9e39aab6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_601a9b116882c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452845/normal_60107edf62840.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460686/normal_601aef4361d54.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/titugome/8390698656.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/ramowafotelabexazo.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/effects_of_globalization_on_indian_economy.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/mouse_party_psychology_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/marine_corps_boot_camp_training_schedule_parris_island.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/zewurajudezav.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/bluetooth_pc_windows_8._1.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/carrom_disc_pool_game_uptodown.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/quadratic_equation_solver_square_root_method.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/modal_verbs_exercises_with_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/needs_analysis_questions_for_sales_training.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_off0000eec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC5 5180 bytes
SHA-256: 85a7b02b78842c01785bba3b943f0c3700dc5451ccacf4922b3d2aaa1ddc7c86
font_01_sfnt_off0001008e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008E 10544 bytes
SHA-256: 834c9663ce116aff5f59cb3024a8ec3a87b0c5fd28c8de000e7c19cf8e3821ae

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