Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e82e25328d1fd9…

MALICIOUS

PDF

136.1 KB Created: 2021-04-05 14:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ad3f786d2a8a9fd329dac4c0e4a51312 SHA-1: f3c3eb2578b3a946cbd994e0fa19202af7dc15e7 SHA-256: d4e82e25328d1fd962b321775cf96e1a0c778183a982f1020dbd1e8296a5992a
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=the+man+in+the+high+castle+netflix+nederland PDF link annotation
    • https://cdn.sqhk.co/subesanodag/gdgcgdt/recent_pirate_attacks_in_the_caribbean.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374847/normal_600e735c1e57d.pdfIn PDF document text
    • https://cdn.sqhk.co/wareberefiz/abxagjE/49984689955.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446045/normal_600062f6d7ae5.pdfIn PDF document text
    • https://cdn.sqhk.co/nadovexum/2iaieNx/rokezejusinenof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461763/normal_5fd3a0a597615.pdfIn PDF document text
    • https://cdn.sqhk.co/fepexeguma/clwGKdJ/rixevuminev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503279/normal_605c725d8e947.pdfIn PDF document text
    • https://cdn.sqhk.co/vikoparif/fbjjEhe/escape_from_alcatraz_escape_room_san_jose.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zupifimiture.rf.gd/88266739497.pdfIn PDF document text
    • http://monebepebozetos.epizy.com/bozedikitelujuxolibediw.pdfIn PDF document text
    • http://kopididutal.epizy.com/battery_percentage_for_symbian.pdfIn PDF document text
    • http://rupewilalefapok.rf.gd/brush_light_photoshop_free.pdfIn PDF document text
    • http://rutenodisekorin.rf.gd/90th_birthday_party_invitations_templates_free.pdfIn PDF document text
    • http://puxajenosetav.epizy.com/259919121.pdfIn PDF document text
    • http://rurasikawasup.epizy.com/mapa_metro_budapest_2020.pdfIn PDF document text
    • http://magewazumeso.epizy.com/dokukarivis.pdfIn PDF document text
    • http://ditejadidoxe.epizy.com/command_and_conquer_zero_hour_maps.pdfIn PDF document text
    • http://xolilevifiw.rf.gd/71754153828.pdfIn PDF document text
    • http://luviwozota.rf.gd/76774779409.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_off0001d848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D848 5452 bytes
SHA-256: 0b6d4c0a84f432948060ffc7448e9d4d36af5495c5e97f79fa005f5afd2bc4d9
font_01_sfnt_off0001eaac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EAAC 12244 bytes
SHA-256: 79d58eb626801e7827222f5b4aa59fd1b8328f737cb5981a503e0f91202366fc

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