Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73b4cbb8f9869bd…

MALICIOUS

PDF

78.8 KB Created: 2021-01-18 02:01:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 520d9401d13fde437b266e9f4a0c322d SHA-1: 18d5224f37596ddfae35abd624738650e21f3c49 SHA-256: e73b4cbb8f9869bd2515a6fa3c0d96ba7beacc9bb370b1bb79d362eac4e98088
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that leads to a domain associated with malicious activity, disguised as crib instructions. While no scripts were directly extracted, the PDF structure and embedded URI heuristic suggest an attempt to redirect the user to a malicious site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/123?utm_term=baby%2527s+dream+generation+next+crib+instructions PDF link annotation
    • https://cdn.sqhk.co/zetikitor/0NXvupu/good_religion_apps.pdfIn PDF document text
    • https://cdn.sqhk.co/wevafofed/c0jajcr/48072193729.pdfIn PDF document text
    • http://zuvinesewuwiz.iblogger.org/beginning_apache_hadoop_administration.pdfIn PDF document text
    • https://cdn.sqhk.co/vujixete/iegj6dW/fefobaxekoputovubumubixuv.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/xukonakefules/townes_van_zandt_documentary_full.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/glocester_ri_police_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/definition_of_data_analysis.pdfIn PDF document text
    • http://rixuzomobe.epizy.com/animation_creator_software_for_pc_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/zojekipezenuzezomugifugi.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/unanswered_phone_calls_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/home_budget_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/best_movie_trivia_app_android.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_off0000f601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF601 5620 bytes
SHA-256: 0409aa419328847de33f1c18474fd481808327d30b7e58b4f6e4961fefa6ad37
font_01_sfnt_off00010921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10921 10876 bytes
SHA-256: e24fe1f63d1be1638680390b270d6f182e5cbf4c70985fbc5dac80892d8b6412

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