Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d9c4a4819d1b53…

MALICIOUS

PDF

70.3 KB Created: 2021-02-20 11:10:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: fbdf8c8e354840382d1b2632d9539bee SHA-1: 088dc0ea32aa7643feee7aa557b8a9dbfb78ccb0 SHA-256: 99d9c4a4819d1b53067a85172d77e5d28946ea983caca75550b1fb4785442e71
166 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://seumenha.ru/wix?keyword=vygotsky+scaffolding+definition PDF link annotation
    • https://ginufadep.weebly.com/uploads/1/3/4/6/134668932/3da220230.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451757/normal_6025f643a4cfc.pdfIn PDF document text
    • https://jeletaru.weebly.com/uploads/1/3/5/3/135321400/06bd8b430332e2e.pdfIn PDF document text
    • http://my-favshope.online/zorusuvidizozusumumalrjojz.pdfIn PDF document text
    • http://privateguardingserviceagainstdanger.site/432955603325jzep.pdfIn PDF document text
    • http://xemopubuga.iblogger.org/3598463218.pdfIn PDF document text
    • http://scotiaenlineape-personas.com/38383961230xoth.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/lepefi/gram_positive_cocci_bacteremia_guidelines.pdfIn PDF document text
    • http://rofizamomu.rf.gd/justin_bieber_friends_song_pagalworld.pdfIn PDF document text
    • http://xinivaj.rf.gd/tokega.pdfIn PDF document text
    • http://konajif.epizy.com/8963441761.pdfIn PDF document text
    • http://kolegigogar.rf.gd/buxusoferewabutekibulu.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/bluestacks_free_for_ubuntu.pdfIn PDF document text
    • http://dunugamufaj.epizy.com/durdans_hospital_lab_reports.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_off0000d84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84C 5224 bytes
SHA-256: 5d2cc33faf881886e3256ea5d7bc16df9de1fc99577c804ccea73c0720cb7f0f
font_01_sfnt_off0000ea44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA44 10072 bytes
SHA-256: a76371e99dea52fd814754d049e0d60cf4b77ec3fef13f17639b073ad5a9642d