Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4beb53d8ea6a6b…

MALICIOUS

PDF

75.6 KB Created: 2021-02-28 18:34:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 9d5c966525748a03bc615787b2bf4fd9 SHA-1: 4bbe36aca2914a8a2f97e9da4a80ee8019cba142 SHA-256: 8b4beb53d8ea6a6b84ce7bcedf2d316d3e9871d97cec0e186082c3edaa7662c5
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The PDF contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://baarspo.ru/123?utm_term=1993+ford+ranger+transmission+fluid PDF link annotation
    • https://cdn.sqhk.co/vopunokapire/RQlibra/fuzanapatamula.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/hot_caramel_latte_dunkin_donuts_calories.pdfIn PDF document text
    • https://cdn.sqhk.co/zolilobup/h4gcFid/best_buy_warehouse_cleveland_ohio.pdfIn PDF document text
    • http://manovina.mypressonline.com/ninapunimiturugifalusogob.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/ajbCJgg/lakirijenepelegitupumuw.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvepelela/hf3hjia/78412391529.pdfIn PDF document text
    • http://jasazotinalol.mygamesonline.org/american_standard_furnace_freedom_90_single_stage.pdfIn PDF document text
    • https://cdn.sqhk.co/bebomopakax/jetBDih/mudevujawen.pdfIn PDF document text
    • http://memowelubi.mygamesonline.org/95643566088.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nixevafuzija.epizy.com/20026240707.pdfIn PDF document text
    • http://nepozuviditesuv.rf.gd/napukubuseteli.pdfIn PDF document text
    • http://sabiwilurase.atwebpages.com/kad_emule_lista_aggiornata.pdfIn PDF document text
    • http://rulamiji.onlinewebshop.net/what_does_similarities_measure_on_the_wisc-v.pdfIn PDF document text
    • http://jirabasojexosud.atwebpages.com/english_speaking_practice_app_free_download.pdfIn PDF document text
    • http://kedisijusa.onlinewebshop.net/once_minutos_resumen_de_cada_captulo.pdfIn PDF document text
    • http://kunimaz.rf.gd/icps_new_guidelines_2018.pdfIn PDF document text
    • http://bavatesivo.myartsonline.com/what_is_mischief_rule_of_interpretation.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_off0000eaf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF5 5504 bytes
SHA-256: c1e7d28144e93d76ded00a07241d89bc1b1938bf150c58e5cd315b9e964b8d4d
font_01_sfnt_off0000fd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD93 9976 bytes
SHA-256: b48e2be4c11438fdd1dea31c3e358f631ede98f20b39a902fa9b5600b71f7b25

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