Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4843df36794ed1…

MALICIOUS

PDF

81.5 KB Created: 2021-03-22 07:15:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3530246ed79c6792d617184b22d3cb47 SHA-1: a4d7627c8c4467dfff95261a094857e4f270825f SHA-256: 6c4843df36794ed1bff61d910523854c568d95cd763a5025a655a4541317f1b8
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 0.9996

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://xajibur.ru/award?keyword=horus+heresy+vengeful+spirit+pdf PDF link annotation
    • http://ouily.xyz/82261995770oiilr.pdfIn PDF document text
    • http://devlp.design/25726410940pmwsn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379841/normal_5fcce19b91b5c.pdfIn PDF document text
    • http://bestplacefor.rest/teologia_sistematica_stanley_horton_gratisp37ys.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455881/normal_5fceac0cd846e.pdfIn PDF document text
    • http://deemonatrafik.xyz/tokazisovefujomahc0x.pdfIn PDF document text
    • http://storezone.info/gta_vice_city_cheats_guidegfvzk.pdfIn PDF document text
    • http://tiktokcopyrighthelpteam.com/5505225564072r4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406516/normal_6047d71e83cf6.pdfIn PDF document text
    • http://steelsho3.club/wurasovefujilupepagolad1vj9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393761/normal_601653daa6cfb.pdfIn PDF document text
    • http://jnatural.space/mufekosewono1dipp.pdfIn PDF document text
    • http://bioforce-co.site/asbestosis_2015lhg3s.pdfIn PDF document text
    • https://cdn.sqhk.co/jawafurovif/hg7Z6uN/find_silent_install_switches_for_exe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465539/normal_5fd38a75dc71e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470699/normal_6042e9396e3ea.pdfIn PDF document text
    • https://cdn.sqhk.co/sabepakofo/jridow8/70302173075.pdfIn PDF document text
    • http://leyloften.online/the_norton_reader_15th_edition_amazonuw83k.pdfIn PDF document text
    • http://fasad-dom.site/how_to_heat_up_frozen_cooked_pastahi4te.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480736/normal_5feef012419cc.pdfIn PDF document text
    • http://vnds-super.space/40330885w5jue.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000103c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C5 5216 bytes
SHA-256: 32aa0729c555e3998e628534ba674e33a3a94fb03f765fad7eef57a181e43030
font_01_sfnt_off00011591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11591 10248 bytes
SHA-256: 04a302403845c41783478ab7d3eb31666bd5785ab760a1aec9fd7b3ebec74790