Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5b4619cd4ae3e6…

MALICIOUS

PDF

65.2 KB Created: 2021-03-19 11:33:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 9141d91751f4620b18cfa6d733bae6a4 SHA-1: b4972f407501a5e1cbe8594c25c0a694058518a8 SHA-256: 4d5b4619cd4ae3e6f844d6f59d7ad357af9dfd4b22032cd0ce91f9f52fbcd327
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jacksth.ru/wix?keyword=rosa+mistica+rosario+arca+de+la+alianza PDF link annotation
    • https://cdn.sqhk.co/lasokixon/cjag6hg/88963098598.pdfIn PDF document text
    • http://regse.website/773048246965lhbd.pdfIn PDF document text
    • http://memilarud.22web.org/prefixes_and_suffixes_worksheets_for_grade_3.pdfIn PDF document text
    • https://cdn.sqhk.co/finelega/Yeha9hb/kipixemuwumureropovetuz.pdfIn PDF document text
    • https://cdn.sqhk.co/bijozugetav/jjid6if/android_recyclerview_onclick_tutorial.pdfIn PDF document text
    • http://itdiscount.pro/52639086951pdpnv.pdfIn PDF document text
    • https://cdn.sqhk.co/gupikekarobo/jWgjS66/learn_spanish_south_america.pdfIn PDF document text
    • https://cdn.sqhk.co/libibajuzumu/ogjohfH/woodland_baby_boy_crib_sheets.pdfIn PDF document text
    • https://cdn.sqhk.co/mogujawogo/idVyafw/2020_nba_mock_draft_best_shooters.pdfIn PDF document text
    • https://cdn.sqhk.co/negolura/dhfzrcW/age_of_empires_2_steam_achievements.pdfIn PDF document text
    • http://forezofulafenu.iblogger.org/vixifararezetuja.pdfIn PDF document text
    • https://cdn.sqhk.co/wijelukifap/ujbhbSX/98777036177.pdfIn PDF document text
    • http://vipmanmarket.space/pubabinibaponufixamuv30s0o.pdfIn PDF document text
    • http://goodsfor.life/drop_fade_curly_hair_black_males4vku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fonumorawupako.epizy.com/61642779676.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/levis_510_fit_guide.pdfIn PDF document text
    • http://kesulokuwap.rf.gd/49463275636.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/free_html_book_store_template.pdfIn PDF document text
    • http://tamefizorala.epizy.com/nowowuvamedeziredesu.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/are_sonic_toothbrushes_really_better.pdfIn PDF document text
    • http://zotapem.rf.gd/67132303060.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/fisutemogubak.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_off0000c4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CB 5144 bytes
SHA-256: c830049d14f92145fa5820f9acc8e13e1c82307a7bd5a1af2afff65455ca6f7c
font_01_sfnt_off0000d639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD639 9808 bytes
SHA-256: daa1d3c92f587090b2c8de22041e1e3a2689b66e3ca6aa84ada571c41c0861e0

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