Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e5b0a8b129daca…

MALICIOUS

PDF

72.9 KB Created: 2021-04-30 09:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 136779ec9a625053f09d01eeea860272 SHA-1: 983eda66fa2c88b0608e82b2bc18eef82d58787d SHA-256: 88e5b0a8b129daca97bf2fd35e9eaadf8b07e6e3806e20aa43ff3deb2783a4a3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://jacksth.ru/strik?utm_term=what+are+some+ethical+issues+in+advertising PDF link annotation
    • https://cdn.sqhk.co/fobevufesupi/gighjhS/29520412205.pdfIn PDF document text
    • http://tarigutese.mygamesonline.org/66307897602.pdfIn PDF document text
    • http://wixiziz.iblogger.org/nigofemizevozofuk.pdfIn PDF document text
    • http://zikevamakag.mygamesonline.org/hotsy_pressure_washer_pump_parts.pdfIn PDF document text
    • http://pikufufunuti.scienceontheweb.net/pawitakakigadanafalam.pdfIn PDF document text
    • http://xaxebegolozagu.iblogger.org/us_navy_advancement_quotas_2020.pdfIn PDF document text
    • http://vizexibidoxi.getenjoyment.net/dimokarono.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/MwShhjc/vilufogugi.pdfIn PDF document text
    • http://zawazubiwezug.iblogger.org/organismo_legislativo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e0deade-7a63-4bc8-91ab-bec5854276d3/12285941302.pdfIn PDF document text
    • http://zaretinigalowu.rf.gd/the_hidden_oracle_chapter_1_summary.pdfIn PDF document text
    • http://nimanexobubibub.onlinewebshop.net/descargar_biblia_de_estudio_arcoiris_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/950b7fe1-c7e9-4866-922e-5d75d84e0cac/dexepanizonevuverufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fa7dd48-1111-4ca5-ba57-5b569fc1a137/bamoxavinikubewolitu.pdfIn PDF document text
    • http://doxokalisawe.myartsonline.com/34874322844.pdfIn PDF document text
    • http://lenaxepejo.rf.gd/convert_to_word_document_online_for_free.pdfIn PDF document text
    • http://nevefilin.rf.gd/medical_dictionary_free.pdfIn PDF document text
    • http://babefuv.epizy.com/tajujajafavoxasovovox.pdfIn PDF document text
    • http://nodikaduf.onlinewebshop.net/sosajikibanuxa.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_off0000e28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28B 5428 bytes
SHA-256: 0136e0cead8fa76cdcb7dc7938336474a5080abaebeee608318f61245f626677
font_01_sfnt_off0000f4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 9916 bytes
SHA-256: 7ea996fdf3aa68e4d45d1f5cc2393082d2ca5db99acc2fb4b730714cd87679fe

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