Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9131e046abf44fc…

MALICIOUS

PDF

70.7 KB Created: 2021-04-12 18:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f67920aa66809f06f47322d1f7802d99 SHA-1: 1b2cb4ea15cfb451f118bbf17820b33a93359fb8 SHA-256: f9131e046abf44fca2b3c8342da2324fa6b08ee7beeb92cb0b4765eca9641a27
96 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as an external URI pointing to 'kuzutuzo.ru'. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing trojan. The document body, though heavily obfuscated, appears to reference a manual, suggesting a lure to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kuzutuzo.ru/strik?utm_term=garelli+super+sport+xl+manual
    • http://jalosus.mygamesonline.org/lazotugoza.pdf
    • https://wisiwojapano.weebly.com/uploads/1/3/4/8/134896472/1175259.pdf
    • https://jisixeda.weebly.com/uploads/1/3/1/4/131409884/ba9f243c31f1.pdf
    • http://wejaduz.mypressonline.com/42692137304.pdf
    • https://kekulewu.weebly.com/uploads/1/3/4/3/134398637/japiporan_rejoviwari.pdf
    • http://zonojebiridizo.mywebcommunity.org/mogotabimowotorovotakulal.pdf
    • https://totamozosapopa.weebly.com/uploads/1/3/4/7/134712517/divuviwelupatakolepe.pdf
    • http://lopitimew.mygamesonline.org/array_programming_questions_in_c.pdf
    • http://zuxuvikewi.sportsontheweb.net/cambridge_primary_english_1.pdf
    • http://gajonedorebuko.mywebcommunity.org/nebex.pdf
    • http://ganoget.scienceontheweb.net/joint_venture_accounting_in_sap.pdf
    • http://zuxuvikewi.sportsontheweb.net/cracking_the_pm_interview.pdf
    • https://zokupirijega.weebly.com/uploads/1/3/4/0/134000213/1e0a294025.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tobaziw/88869781380.pdf
    • http://supajiwa.myartsonline.com/papata.pdf
    • https://s3.amazonaws.com/zizene/devejo.pdf
    • http://gakamaxoluzes.atwebpages.com/backseat_pilot.pdf
    • https://uploads.strikinglycdn.com/files/831a9a82-6db2-4930-ab5f-96ff573d5307/digital_marketing_course_online_free_with_certificate_in_hindi.pdf
    • https://s3.amazonaws.com/fosalizuzu/format_for_writing_application_for_job.pdf
    • https://s3.amazonaws.com/rexogeguxosix/85043600481.pdf
    • https://uploads.strikinglycdn.com/files/31631dcf-b2cf-4413-91a3-44c20cb63ec8/narexenuwomevu.pdf
    • https://s3.amazonaws.com/wurivuve/english_speaking_course_free_online.pdf
    • https://uploads.strikinglycdn.com/files/018d0375-56d5-4241-9600-350b20cbd622/percy_jackson_titans_curse_graphic_novel_read_online.pdf
    • http://kejagabato.myartsonline.com/sql_injection_tutorial_step_by_step.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca82.bin
7db4aa9dcfc42b3a6ef9a04f555e0b2fea6a31cf0b1e3bf67d3f0cf3b72bc559		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA82 3304 bytes
font_01_sfnt_off0000d667.bin
e539b2fa772fadff61d57d48bad2ca75837a553b0e3ffba7d4adfc77eec8dfd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD667 5064 bytes
font_02_sfnt_off0000e792.bin
eecf4915a5cd603b187357807020374d739d4713e26f4ddac21acb8a0372d454		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE792 10500 bytes

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