Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5ced71133bd36b…

MALICIOUS

PDF

73.6 KB Created: 2021-02-15 20:39:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2ce8b115443424559f922b2c26450ad0 SHA-1: bb20ea2e20b7eb05a66b05ee11f43e7588fbdf65 SHA-256: ef5ced71133bd36b9503ac5662fea6a65f13d64fa112b655046c244c017bee37
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and heuristic firings indicating it is a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to exploit users through deceptive 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://seumenha.ru/123?utm_term=why+is+academic+text+important+for+students PDF link annotation
    • http://fepemewavitik.66ghz.com/gravity_falls_dipper_s_guide_to_mystery.pdfIn PDF document text
    • http://bobixuposu.22web.org/accreditation_standards_fact_sheet_for_aged_care.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/GidJsgi/pazigadasamefel.pdfIn PDF document text
    • https://wojaxesisitofem.weebly.com/uploads/1/3/4/7/134717171/kigexexilaku_wipesag.pdfIn PDF document text
    • http://dimoguzix.iblogger.org/xusuzejabati.pdfIn PDF document text
    • https://vawosogujatu.weebly.com/uploads/1/3/5/2/135293246/mimomuvala_kilibex_tigapezizakume_kamesar.pdfIn PDF document text
    • https://cdn.sqhk.co/murafabu/sohajhF/38300348368.pdfIn PDF document text
    • http://zapapoberok.iblogger.org/birds_sounds_in_tamil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bopuxenuxesozu.rf.gd/rajusanulanunisuruve.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/esc_guideline_heart_failure_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/5831503754.pdfIn PDF document text
    • http://gakenefux.rf.gd/osrs_arceuus_spellbook_guide.pdfIn PDF document text
    • http://padepivezaw.rf.gd/alcohol-_forming_fatty_acyl-_coa_reductase.pdfIn PDF document text
    • http://xusexupilaru.epizy.com/77476397397.pdfIn PDF document text
    • http://turepebixorara.rf.gd/44615900767.pdfIn PDF document text
    • http://lajirobodogew.epizy.com/geomorphology_books_free.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_off0000e237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE237 5544 bytes
SHA-256: e47e04211a38351398c901f271656aa2bcf107878ad1762d455b4013eda2a9dc
font_01_sfnt_off0000f500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF500 10504 bytes
SHA-256: bdcf78b2a8edc9edcadcdf85ce2bb64a3fb0af5ea31fd419784316358132360b

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