Malicious PDF — malware analysis report

Static analysis result for SHA-256 f283cec098ca99ba…

MALICIOUS

PDF

87.6 KB Created: 2021-03-07 09:43:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 80a4beb7493cb650c5643d5e82e98462 SHA-1: 544ba75876d558c6a38f206585354cbec19a1716 SHA-256: f283cec098ca99bacf8d6482d72da0ebf97e31c2a89bbbe911cc358a0caabb8d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and one specifically uses a UTM term suggesting a search result lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious campaign.

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://resalured.ru/aws?utm_term=logitech+harmony+ultimate+one+manual PDF link annotation
    • http://bajifepeselok.sportsontheweb.net/vabemipafizat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416811/normal_5ff90d0818769.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459321/normal_6002723d79677.pdfIn PDF document text
    • http://majexifavel.scienceontheweb.net/stock_market_open_tomorrow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376850/normal_6006b335179c5.pdfIn PDF document text
    • http://minesaxofunawi.getenjoyment.net/5th_grade_common_core_math_volume_worksheets.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488130/normal_5fde650eb7676.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vobozezojip.onlinewebshop.net/21786170201.pdfIn PDF document text
    • http://sisufovofow.atwebpages.com/bajimanok.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/finesavafobomixakeginogaf.pdfIn PDF document text
    • http://fowasabitafal.epizy.com/zakawavatu.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/xukegesifotozonadubel.pdfIn PDF document text
    • http://judewal.rf.gd/limil.pdfIn PDF document text
    • http://gazadimo.rf.gd/46100050732.pdfIn PDF document text
    • http://mijovutotukedes.onlinewebshop.net/58754441947.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/spot_report_sample_for_security_guard.pdfIn PDF document text
    • http://kezuxitejapub.epizy.com/burp_suite_manual_spider.pdfIn PDF document text
    • http://pikobazu.epizy.com/microsoft_access_basic_tutorial.pdfIn PDF document text
    • http://gesaneju.rf.gd/o_que_so_sistemas.pdfIn PDF document text
    • http://lojiwifi.epizy.com/41313763966.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_off00011ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB8 5080 bytes
SHA-256: b6fce66da8c9c4c4269cf8a5f5e88cac3ba6e93469c36864a7397343b4b1a361
font_01_sfnt_off00012be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE9 10884 bytes
SHA-256: 642309eba2418a8dbb2b996edcadb3be60155ac9310f6c41cd743f9b6d137be8

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