Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf6a9d4a50d7881…

MALICIOUS

PDF

73.5 KB Created: 2021-03-27 11:31:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2dd3ac4b255a964e87d3831016d796dc SHA-1: 56a3755308d65fe27f1917b5e2daa4f236365254 SHA-256: bbf6a9d4a50d7881c232f7315ee5374acb7c1657fe56c14364f7e08385df378a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=scratch+2+free++software PDF link annotation
    • http://risonubokedoxav.scienceontheweb.net/castrol_magnatec_stop_start_0w30_d.pdfIn PDF document text
    • https://cdn.sqhk.co/denidugabuni/hfjaGCN/80333655600.pdfIn PDF document text
    • http://purpless.vip/jquery_animate_css_transformhzc1i.pdfIn PDF document text
    • http://majovevalaji.sportsontheweb.net/circle_the_greater_number_worksheet_for_kindergarten.pdfIn PDF document text
    • http://itdomen.fun/44984136274bymk3.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/te_mueves_tu_lyrics.pdfIn PDF document text
    • http://philonio.online/48502237780h9d31.pdfIn PDF document text
    • http://zumepaposakuf.scienceontheweb.net/zefexuba.pdfIn PDF document text
    • https://cdn.sqhk.co/wavudasawete/gfAXjcL/jonojipuvexavasinumoru.pdfIn PDF document text
    • https://cdn.sqhk.co/susopavazane/RhafhgS/launch_point_church_tuscumbia.pdfIn PDF document text
    • http://priz24.site/how_much_does_it_cost_to_run_a_1500w_ceramic_heater0xoew.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/makixibawumebol/43292553428.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/gotimonekarazan.pdfIn PDF document text
    • http://zedowep.atwebpages.com/whos_afraid_of_virginia_woolf_movie_explanation.pdfIn PDF document text
    • http://lurozakilaxa.rf.gd/metropolitana_mosca_mappa.pdfIn PDF document text
    • http://sisufovofow.atwebpages.com/30678917314.pdfIn PDF document text
    • http://nifusotajezunur.atwebpages.com/que_es_el_manifiesto_comunista_resumen.pdfIn PDF document text
    • http://jezevenakos.myartsonline.com/41744117355.pdfIn PDF document text
    • http://nodikaduf.onlinewebshop.net/dojatisademivopen.pdfIn PDF document text
    • http://julizut.rf.gd/lexujetusopufezunapumupi.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/pizifisugi.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_off0000e3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BB 5264 bytes
SHA-256: 94f9425ec2e49978fd464da1002f80a63f3466b3abe00cbcf4626fe4ff4da4cb
font_01_sfnt_off0000f5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B3 10680 bytes
SHA-256: 5f991b5180fea0f5d0012dfdf80dddc7cee4b18f55958c6f297fb7c62a78ffcc