Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88739f3da573a65…

MALICIOUS

PDF

74.5 KB Created: 2021-03-04 12:04:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fc3cc5135f75d97e5a42d02071715244 SHA-1: 99910537c7b07e7bd24d348501a5e730ab2f9a3f SHA-256: a88739f3da573a65f87598f76327627bc033d759251cf689fa984d0c5d93b15b
126 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many hosted on disposable domains, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious lure designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/123?utm_term=how+to+replace+battery+in+kindle+fire+hdx+7 PDF link annotation
    • http://zipujesilan.22web.org/34321146796.pdfIn PDF document text
    • https://cdn.sqhk.co/vilosezuj/jhwjick/zetebugitipowuda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_60226aca135f6.pdfIn PDF document text
    • http://zikuwojanubeg.iblogger.org/i_10_traffic_report_arizona.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445731/normal_5fe75becbefb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381091/normal_5fd974124b4f6.pdfIn PDF document text
    • https://cdn.sqhk.co/bikulatitaxe/LichaFN/at_t_vpn_client_support.pdfIn PDF document text
    • http://pazadixokumox.sportsontheweb.net/fojunovo.pdfIn PDF document text
    • https://cdn.sqhk.co/jesupasuzoku/iWUwjdH/nova_launcher_mod_apk_6._2._12.pdfIn PDF document text
    • http://zibalada.iblogger.org/prometheus_unbound_summary_gradesaver.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://niforubuduxema.epizy.com/81788024499.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/how_to_format_a_screenplay.pdfIn PDF document text
    • http://muluwokixo.onlinewebshop.net/how_to_turn_on_cuisinart_toaster_oven.pdfIn PDF document text
    • http://gofosuxubajo.epizy.com/formazione_apprendistato_professionalizzante_regione_campania.pdfIn PDF document text
    • http://semisoriguregix.epizy.com/obusforme_king_mattress.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_off0000e698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE698 5572 bytes
SHA-256: 8c18a141aa7275709444c8a8c0391fde58bd7521bc3833f78992d00a2161adc9
font_01_sfnt_off0000f9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A0 10400 bytes
SHA-256: d74260a22ffd18f071bc32332e8da1688da918513eeeecf2ee1e4bc247e3e4b6

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