Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4423023a6a7246…

MALICIOUS

PDF

77.3 KB Created: 2021-02-26 01:48:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c0c4a00521daacaa7d7c9fabeca77808 SHA-1: 778a397015f5456a78311acb840d41cbd86f283f SHA-256: de4423023a6a7246c1036b2aeffc269b0ffd52ab8dcb5d24149a8044f35e38a5
154 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious. The document body, though heavily obfuscated, appears to contain text related to 'self presentation strategies', which is likely a lure to disguise the malicious intent of redirecting the user to a potentially harmful URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/strik?utm_term=what+is+self+presentation+strategies In PDF document text
    • https://cdn.sqhk.co/sebazisop/cihtha3/drop_it_low_ester_dean_dance.pdfIn PDF document text
    • http://appless.space/newborn_checklisto366u.pdfIn PDF document text
    • http://afracheat5.xyz/epiphany_lesson_for_kindergartenvsdd8.pdfIn PDF document text
    • http://jijufik.22web.org/hernia_hiatal_sintomas_y_tratamiento.pdfIn PDF document text
    • http://bemelegevew.22web.org/marvel_movies_coming_out_in_2021_dates.pdfIn PDF document text
    • https://cdn.sqhk.co/fakomuse/lsiInij/70053027336.pdfIn PDF document text
    • https://cdn.sqhk.co/mudebijutene/1jen7ig/kanto_starters_in_pokemon_sword.pdfIn PDF document text
    • https://cdn.sqhk.co/givogaduta/bicxif5/run_vs_sniper_fortnite_code.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/fipijife/business_model_canvas_template_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/stc-1000_keezer_wiring.pdfIn PDF document text
    • http://xefavab.rf.gd/buy_online_antique_mirror_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/age_of_wonders_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/jozesekepusuw.pdfIn PDF document text
    • http://nulabede.epizy.com/femubupodosej.pdfIn PDF document text
    • http://risutunuf.epizy.com/best_online_project_management_certification_courses.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/59716093009.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/lagu_celengan_rindu_cover_keisya.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_off0000f0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D0 5176 bytes
SHA-256: 92f43c3f20ea10c8c90695990a82a0bbc0db55c7a7dd45dc3a37b2683e0c0f45
font_01_sfnt_off00010279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10279 11088 bytes
SHA-256: 95137ce3f6b94ae21d9e65ca6107f2b5302669578be7c8eb15bb3f7a26146c7d

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