Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6590dbbf05bfd30…

MALICIOUS

PDF

96.9 KB Created: 2021-03-26 17:44:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b09776459c08226a784072e7176680df SHA-1: 7bbc9e9caad43bdebdea03837739598101555c42 SHA-256: b6590dbbf05bfd307540c556a5149bb44549e0877c966b9d6f1c343794c0c247
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 point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/award?keyword=breaking+into+wall+street+ib+interview+guide+pdf PDF link annotation
    • http://nijubuwuw.iblogger.org/business_books_download_free.pdfIn PDF document text
    • http://smartline58.ru/usmc_corporals_course_test_answersm8cep.pdfIn PDF document text
    • https://nokesopupikes.weebly.com/uploads/1/3/4/7/134767934/7618986.pdfIn PDF document text
    • https://latitatuforuza.weebly.com/uploads/1/3/1/3/131398212/vizorotojine_kuduperepatebuj_betuwazix_rovebajapina.pdfIn PDF document text
    • http://m-laskin.ru/742458055574tt58.pdfIn PDF document text
    • http://zoosalon.org/vutitorowukawe8tns9.pdfIn PDF document text
    • http://joteruzawareba.iblogger.org/9606983266.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/fosagoba/senior_management_job_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/digital_electronics_notes_nptel.pdfIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/17036540740.pdfIn PDF document text
    • http://fametofet.rf.gd/how_to_write_hangul_stroke_order.pdfIn PDF document text
    • http://bafuxinasu.epizy.com/butapirufixoduxisabe.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/19199611020.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/95583315931.pdfIn PDF document text
    • http://vutilunero.rf.gd/68912918901.pdfIn PDF document text
    • http://mabobubokinevo.epizy.com/46431851818.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/why_doesnt_cbs_all_access_have_all_episodes.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_off00013c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9A 5616 bytes
SHA-256: afad2497f223dd5e235601587b535e7f1fb86b4043dd6d266b80ce9e172f7da6
font_01_sfnt_off00014fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE1 11436 bytes
SHA-256: e7d8c3862c62996e551e78f38edaa35148af2b462436d26d1faa346c395a1400

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