Malicious PDF — malware analysis report

Static analysis result for SHA-256 2238c5cf1cc27993…

MALICIOUS

PDF

79.7 KB Created: 2021-04-01 00:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 63974052dfb5c759f8c6359052341397 SHA-1: 7141011391f95881f67fb29a3461737bffdd3c11 SHA-256: 2238c5cf1cc27993eeb2b63a3609277b4db48c13fa91d8f0bad510e515a50768
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://soxebez.ru/strik?utm_term=selling+back+leave+days+army+calculator PDF link annotation
    • http://piredvizhnik.com/60454149623sa4x7.pdfIn PDF document text
    • http://vomeperegobo.22web.org/dasunonuxopet.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422906/normal_60016af31e2ed.pdfIn PDF document text
    • http://keysecret.ru/how_to_write_a_polynomial_in_standard_form_from_factored_form291fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379387/normal_60502cca32f6e.pdfIn PDF document text
    • http://nicechange.space/fl_dcf_reportingh4beb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490757/normal_5fd9c80d93151.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389354/normal_604b268a1e4b0.pdfIn PDF document text
    • http://waduresiwiboba.iblogger.org/18143823829.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454665/normal_5fd7c180da9d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479226/normal_5fc88bbf86f7e.pdfIn PDF document text
    • http://afracheat1.xyz/sodikomone3d00x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_601c8bbb1a202.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415326/normal_5fe843e52fd48.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/88988661938.pdfIn PDF document text
    • http://bekabugi.epizy.com/11107155000.pdfIn PDF document text
    • http://xiburebejevikom.rf.gd/which_book_comes_after_blood_of_olympus.pdfIn PDF document text
    • http://petetilazuji.epizy.com/9162357910.pdfIn PDF document text
    • http://liwiwixorajedik.rf.gd/python_programs_using_functions.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/dipopuruwaj.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/jamukugobur.pdfIn PDF document text
    • http://delisomujiroma.epizy.com/oracle_fixed_assets_depreciation_report.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_off0000f90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90F 5728 bytes
SHA-256: 098bec4585baa5c98aaccc732bb70d0ef5d226a9837c275015f904d551dd87df
font_01_sfnt_off00010c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C89 10900 bytes
SHA-256: f46e7c6c67457d5ccd32f8bd2d7992c2e1ce37ceca77a757744b4484d28492c4

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