Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e9015306998cd7…

MALICIOUS

PDF

77.3 KB Created: 2021-04-08 03:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 91add12af17b144f7cca6f0b73302576 SHA-1: b0f88afffd28bec6352b37a27827c372cd85c68d SHA-256: a2e9015306998cd7ead78d04235dbd5d97a56c7a14e1f163ff11bac4d2e37cbc
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning model as malicious, specifically as a phishing or trojan distribution attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection infrastructure. The primary URL, 'https://resalured.ru/123?utm_term=voya+index+annuity+rate+sheet', likely serves as a lure for phishing or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=voya+index+annuity+rate+sheet PDF link annotation
    • http://lezofifividex.scienceontheweb.net/giwefefagabonesejuvurel.pdfIn PDF document text
    • http://vozuzutiwajuzip.getenjoyment.net/the_economist_style_guide_12th_edition.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/coffee_break_italian_lesson_notes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421960/normal_606cf5a1d887a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481065/normal_603805a747f4b.pdfIn PDF document text
    • http://pamatidela.getenjoyment.net/industrial_waste_management_notes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojibovel.myartsonline.com/58076389621.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1af62863-f772-4b49-a125-44b3bdd2646b/murray_rear_engine_riding_mower_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1deb89d-da38-4ce2-81e9-54ef7e2ad8b5/kauai_road_map_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c308546b-69b3-4067-8e3c-2e457d0c0c73/what_are_the_duties_of_a_corporate_lawyer.pdfIn PDF document text
    • https://ecf1b359-4982-44d9-836f-7e6f5fec4aa1.filesusr.com/ugd/da15c8_002bbbef78984ecdad2a14518f1df388.pdf?index=trueIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_ce77ce286e3c4ac39ef2cbf5d3711ccc.pdf?index=trueIn PDF document text
    • http://zabirozoxut.epizy.com/financial_report_dashboard_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c7dd8a1-b866-473c-9f6b-973325ad9e51/66110922331.pdfIn PDF document text
    • http://vepitejususas.atwebpages.com/application_programming_interface_definition.pdfIn PDF document text
    • http://xexasuwoxomiba.rf.gd/fox_news_houston_traffic_reporter.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_off0000f00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00D 5016 bytes
SHA-256: 02e536e6b8ebb020fa212d875371ddf79724645f5d019422d8728538568a6419
font_01_sfnt_off00010120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10120 11616 bytes
SHA-256: 387c5c8fc6e2d3a7cb33ee51e3ba1a3697be11a13f1ba30e5c2cb6b9ae4d3f42

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