Malicious PDF — malware analysis report

Static analysis result for SHA-256 3463c1a7bcd27c0f…

MALICIOUS

PDF

76.0 KB Created: 2021-03-11 19:44:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 53e0b27a06a59d65a38fdfb6360ab91f SHA-1: 59f3979ffca864368faa2a6912b079329f0215ab SHA-256: 3463c1a7bcd27c0f236c19f59b45a7b678d11e6834ad9a1cf99a8d181d59bb5d
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 0.9996

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://jottigo.ru/award?keyword=ccna+sample+test+questions+pdf PDF link annotation
    • http://zumewidife.mygamesonline.org/nuxabutosipebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421778/normal_60183ebe3c316.pdfIn PDF document text
    • http://pegajopakazo.22web.org/36824797438.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/hgfjjia/7314498361.pdfIn PDF document text
    • http://maxufadewodov.22web.org/manualidades_con_palitos_de_madera_para_nios.pdfIn PDF document text
    • https://cdn.sqhk.co/vurikede/htxAjcI/light_me_up_again_mp3_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/ZjhaCjf/mindware_elevator_marble_run_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/csMjhgg/hammer_union_suppliers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489402/normal_601b6418521dc.pdfIn PDF document text
    • http://motarojetox.sportsontheweb.net/17055671654.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387933/normal_5fcb22c26ce50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501028/normal_60177391c882d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suwapazuxesara.epizy.com/nuvupe.pdfIn PDF document text
    • http://duribolatajofa.atwebpages.com/suxase.pdfIn PDF document text
    • http://tikazujewujotux.rf.gd/kitisugefogapivopateto.pdfIn PDF document text
    • http://suxugumisa.epizy.com/85991591394.pdfIn PDF document text
    • http://bazudujowirev.epizy.com/kaguradijekizawiwelol.pdfIn PDF document text
    • http://bajivuselome.epizy.com/nasosebifegajovojaketen.pdfIn PDF document text
    • http://zoriwotub.rf.gd/50880957090.pdfIn PDF document text
    • http://kituvofaxur.epizy.com/sejirakotik.pdfIn PDF document text
    • http://gemuviwir.rf.gd/november_2017_printable_calendar.pdfIn PDF document text
    • http://sasusijuxekexo.rf.gd/how_to_make_homemade_ro_water_purifier.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_off0000eb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB26 5236 bytes
SHA-256: e111637455ac96291f62aba910a72b09f17a73c8875c05e9f6d94becbabb3ba0
font_01_sfnt_off0000fce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE4 11160 bytes
SHA-256: 90c8946dd781346713fd0cf17de0adf4d98aff48e8057a999eab0c40b84c40ff

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