Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f641d18bf55774…

MALICIOUS

PDF

79.2 KB Created: 2021-02-25 01:53:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b456b0b093b24004154a9422c9a12e76 SHA-1: 3731bad027b804830224a9190cf3418e25c72b58 SHA-256: 54f641d18bf55774043cac8be6880e83f0c5b463c2945424a5c3de50928fa808
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains a large number of embedded URIs, many of which point to disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=notice+in+lieu+of+subpoena+nj PDF link annotation
    • http://uuuuull.space/941030596776bhhx.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/75036571056.pdfIn PDF document text
    • http://sosed.market/akulaku_apk_for_laptop3ncd2.pdfIn PDF document text
    • http://wezaxofakobitig.22web.org/stored_procedure_in_sql_server_2012.pdfIn PDF document text
    • http://vukosam.22web.org/mikiwijozemebinorunofi.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/91942459017.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/nuvodeguwawetudazajakono.pdfIn PDF document text
    • http://tohld.in/metric_conversion_worksheet_1_monaco_education_service_answer_key77d9b.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/84230160173.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/cHhghjB/zijagitenabu.pdfIn PDF document text
    • https://cdn.sqhk.co/ninubisidire/gigcidH/vozejivamugo.pdfIn PDF document text
    • https://cdn.sqhk.co/tekonunise/ieMejfs/cute_dogs_for_sale_real.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sogivuwe.onlinewebshop.net/roxabexedul.pdfIn PDF document text
    • http://tososite.onlinewebshop.net/59697428694.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/26684429979.pdfIn PDF document text
    • http://nojikigor.myartsonline.com/the_wanderers_where_are_they_now.pdfIn PDF document text
    • http://dupikupujetilu.rf.gd/fijasaw.pdfIn PDF document text
    • http://pixudavevenute.rf.gd/wordpress_set_user_permissions.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE80 4980 bytes
SHA-256: 11a751b2e7e988bb21c589d5ed4ceb5f495ac5f5bdc318bc0b2c847f405e6da7
font_01_sfnt_off0000ff84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF84 10000 bytes
SHA-256: 708abc56a426c26d5b7363a74714919b60b4d116bf152fb9043c7431cc9aa5e6
font_02_sfnt_off000121b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B2 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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