Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25ac75d3c6cfbf8…

MALICIOUS

PDF

83.5 KB Created: 2021-04-07 18:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a6331bfeba1623586684807179ad6a7a SHA-1: 043affea74520a134c396ce7d66653e4fe1943e1 SHA-256: b25ac75d3c6cfbf80ca1ef292ef20bf26739b13005fc864e0282431d7be935c7
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 for Pdf.Phishing.Trojan, and an ML classifier indicating maliciousness. The document contains numerous embedded URLs, with one prominent URL pointing to `https://xezojetit.ru/123?utm_term=employee+development+plan+template`, suggesting a phishing or credential harvesting attempt disguised as a legitimate document. The presence of many links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xezojetit.ru/123?utm_term=employee+development+plan+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448094/normal_606529dcf3196.pdfIn PDF document text
    • http://wowirawemiwobod.22web.org/barbell_medicine_the_bridge.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/jFiaOgd/kamiwuzopinogekupa.pdfIn PDF document text
    • http://getyourscore.info/pile_foundation_design_excel_spreadsheet9hcl3.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/dichhif/rarumamabowojotovasiw.pdfIn PDF document text
    • http://gadosamu.iblogger.org/dokuverorubosadu.pdfIn PDF document text
    • https://cdn.sqhk.co/bidelefo/ihicehg/508869762.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384645/normal_5fdc53889aa04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459035/normal_6033130368bb9.pdfIn PDF document text
    • http://zuwazari.22web.org/sejaxewigujosufetevano.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487399/normal_5febc249ba655.pdfIn PDF document text
    • http://lp-consalt.ru/rufokudpmz54.pdfIn PDF document text
    • https://cdn.sqhk.co/tagorotage/dgiheQC/xekevajilekamisexonowizob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486983/normal_5fd2c942dac39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suxikikafib.epizy.com/krakatau_steel_annual_report_2015.pdfIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_4d69e686d2844b1e9dba6bd804898f2f.pdf?index=trueIn PDF document text
    • http://nelojodopon.epizy.com/13270467903.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12a2ddb0-04d7-41fc-b8dd-ce11812ef4ff/what_is_the_gender_and_development.pdfIn PDF document text
    • https://6bfd3344-23d3-4e03-ab7d-00c1c23eecf6.filesusr.com/ugd/be19e1_984e1784bbc242a3ab26ae2e28a2461d.pdf?index=trueIn PDF document text
    • https://b40f07b9-a98f-42b6-a6e2-5dc2c82ebb0e.filesusr.com/ugd/e949ea_b17eae6a0ad8403d8bb2ce0108d06c78.pdf?index=trueIn PDF document text
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_43e78df621044fceae8b14cc2e98ae77.pdf?index=trueIn PDF document text
    • https://3e80c8bf-0031-4ca1-bfa9-4484641fefed.filesusr.com/ugd/08103e_9f8c055e1e60457fbe0d3011231b6647.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/498079f9-728b-49db-ab18-0fd74def5384/how_to_write_a_due_diligence_report_for_investment_purposes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a3e0624-c934-4981-bc3f-d9cef9356858/94406855201.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_off00010a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A77 4948 bytes
SHA-256: c17c51fd9479c46bc709f5c7ac5ea4375621599d333769c44a0ff4e5fd5d25e2
font_01_sfnt_off00011b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4D 10748 bytes
SHA-256: 9ef5a0437a614c3dfee68b0268f9f47a1e3972ec601e9e238513c25b95d765d0