Malicious PDF — malware analysis report

Static analysis result for SHA-256 de52388bddf9b8f8…

MALICIOUS

PDF

66.1 KB Created: 2021-02-15 10:14:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 3ca6d935f8f2e60b32c28dafe97bd197 SHA-1: 0e71ed2ce39c3f1e1eb643ec00ac234e20610432 SHA-256: de52388bddf9b8f8f07ea2e5b88f5bac04b2d863a1673c489197c8328adf7c22
186 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=7+letter+countries PDF link annotation
    • https://cdn.sqhk.co/xamizine/ejFDEif/unicorn_run_2019_kuching.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449793/normal_600df1a827596.pdfIn PDF document text
    • https://cdn.sqhk.co/neviragar/Hjfljhs/std_10_new_syllabus_2019_gseb_gujarati_medium.pdfIn PDF document text
    • https://lodikesilir.weebly.com/uploads/1/3/4/8/134868057/devutobizorewul-dugovo-silibokemisunen.pdfIn PDF document text
    • http://xupenirulavep.iblogger.org/swagger_codegen_cli_jar.pdfIn PDF document text
    • https://zalajugimawif.weebly.com/uploads/1/3/0/7/130739284/penow_xifumiw_walif.pdfIn PDF document text
    • https://cdn.sqhk.co/tategupet/i7Pgdut/super_bomberman_r_ps4_review.pdfIn PDF document text
    • https://cdn.sqhk.co/levuzivanu/gGgglhi/fuguxanemiwekozit.pdfIn PDF document text
    • https://wifamiwipefap.weebly.com/uploads/1/3/0/7/130738562/nujifoga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xepalufozakot.epizy.com/22776944908.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/14659395047.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/rozirojepabovanosani.pdfIn PDF document text
    • http://tarobajasupimi.epizy.com/critical_thinking_course.pdfIn PDF document text
    • http://jozekajevama.epizy.com/audiomack_for_windows.pdfIn PDF document text
    • http://wikilupari.epizy.com/gisubakij.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_off0000c98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98A 4568 bytes
SHA-256: 3ee370740dcd5ca6898074a904443e8e7e50dc6693a7360b1e213305687781de
font_01_sfnt_off0000d926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD926 10040 bytes
SHA-256: 0f21ca36be48833eb4491d060f3ef1444f948c189d81445512864fa21ef095cb