Malicious PDF — malware analysis report

Static analysis result for SHA-256 830c0406c94ae87f…

MALICIOUS

PDF

72.5 KB Created: 2021-02-02 10:41:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: dc56bc3f269017bf3603bfe0163026b6 SHA-1: ebe5a71080dfe4ea0bc593f0ef903d3f7ac59b09 SHA-256: 830c0406c94ae87f74b6bec61aaf07ff2ccadf97376036fa3c6630496b5884f4
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that leads to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, appears to reference 'free energy worksheet answers', suggesting a social engineering lure.

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
  • 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://jottigo.ru/123?utm_term=free+energy+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/pikukafil/igiEDHJ/wusewuzefonubab.pdfIn PDF document text
    • https://cdn.sqhk.co/nivipanevi/5ogjfxs/smithsonian_channel_schedule_uk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500425/normal_5fe26947a7153.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464077/normal_5fe24adca38aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365626/normal_600de8399609c.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/iigghia/nirozoburoxuki.pdfIn PDF document text
    • https://cdn.sqhk.co/fejisedetu/CheigRL/konoboxemavupuvuxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384144/normal_5fef16e4c8783.pdfIn PDF document text
    • https://cdn.sqhk.co/kasavakujosi/W1idifm/mp3_player_download_music_for_free_converter.pdfIn PDF document text
    • https://cdn.sqhk.co/noxibogalu/dggggic/91144837787.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/wozowuledij/fishing_reports_long_island.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/agneepath_movie_songs_pagalworld.pdfIn PDF document text
    • http://dudolisimak.epizy.com/title_page_apa_format_6th_edition_template.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/91529824567.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/zanaxerap.pdfIn PDF document text
    • http://jeruzofifisamen.rf.gd/faguzobenile.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/information_asymmetry_l_g.pdfIn PDF document text
    • http://jabelakejirer.epizy.com/informal_interview_synonym.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/counting_patterns_worksheets_grade_2.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_off0000dd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD19 5128 bytes
SHA-256: 0a7ff43c84923e58cdd6dd2287b48741f81ae31397f087a23641a193adeb9547
font_01_sfnt_off0000eeaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAA 11376 bytes
SHA-256: 321818a5d03c9cecef073169a4b1569bab1e4277287722b89bff826c7ad9b474

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