Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2a9cff77a3b2c7…

MALICIOUS

PDF

79.4 KB Created: 2021-03-30 03:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2d1771b4a726a4a4c9f52c3564765e7d SHA-1: 6f0ebb3742bda91f818eadc88942738f9786a32c SHA-256: da2a9cff77a3b2c750d1071f8964fc6250fe2b425c68d8563ba16072072030d4
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs suggests the document's purpose is to redirect users to potentially harmful sites.

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://midufefew.ru/award?keyword=map+projections+in+gis+pdf PDF link annotation
    • http://checkmycredit.info/14852106560xo6k9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380859/normal_5fed303adeef7.pdfIn PDF document text
    • http://tobazoduto.22web.org/hamilton_beach_toaster_oven_rotisserie_recipes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496151/normal_5ff8ed26b1e6e.pdfIn PDF document text
    • http://dabopoxele.getenjoyment.net/cursos_de_ingles_en_college_new_york.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467298/normal_5ff3677b5a4d1.pdfIn PDF document text
    • http://gojuvop.iblogger.org/topographic_map_worksheet.pdfIn PDF document text
    • http://fopekoriw.sportsontheweb.net/87568892341.pdfIn PDF document text
    • http://reform-st.ru/14113581626w4qx.pdfIn PDF document text
    • http://summer-italy.fun/wirakatafafuzegivojrv8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lujijetani.epizy.com/byomkesh_bakshi_bengali_golpo.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/bompani_gas_electric_cooker_manual.pdfIn PDF document text
    • http://bisodusar.epizy.com/kugomasovunoralo.pdfIn PDF document text
    • http://sovogezo.atwebpages.com/acer_aspire_n1996_motherboard_manual.pdfIn PDF document text
    • http://juxesewipusiz.rf.gd/91242357267.pdfIn PDF document text
    • http://xerunutogufoj.epizy.com/tifilezefuvi.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/causativa_en_ingles_ejercicios_resueltos.pdfIn PDF document text
    • http://momerulazem.rf.gd/3973324833.pdfIn PDF document text
    • http://darajakejaxise.rf.gd/intersecting_lines_worksheet_answer_key.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_off0000f632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF632 5372 bytes
SHA-256: 37399a0628a2c058a52fd6d7cd485c3ca473a8d3b293cd3aad95a7a9c28c670d
font_01_sfnt_off0001089a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089A 11940 bytes
SHA-256: f6b5c335620192bd5109d6902d61844b5423fd7aa6582762be12b0849cb0a089

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