Malicious PDF — malware analysis report

Static analysis result for SHA-256 a421b066b2fedc5f…

MALICIOUS

PDF

114.9 KB Created: 2021-03-23 15:24:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 65c4f56b65f3a3a14e2f6889b92a2ef2 SHA-1: 5a33ae19339a435f1bf2d3702c072a5f7a2b25fc SHA-256: a421b066b2fedc5f6a2f84206ecfdc329b77f54a30cdcc8685d6c7555dc2ccec
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content, likely a phishing page or a download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/wix?keyword=dcu+assignment+guidelines PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369305/normal_60474ac1c1944.pdfIn PDF document text
    • http://bovewitavivebu.getenjoyment.net/ripudut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480148/normal_60187e5aa7b2f.pdfIn PDF document text
    • http://domensita.fun/cheap_hotel_room_booking_siteszowvf.pdfIn PDF document text
    • https://minufagotokuwak.weebly.com/uploads/1/3/4/4/134489045/zonorix_wosapedibajomos_rowixe.pdfIn PDF document text
    • http://palaxofivuleduj.medianewsonline.com/weber_spirit_210_vs_215.pdfIn PDF document text
    • http://pazifelurup.medianewsonline.com/44317651044.pdfIn PDF document text
    • http://getsalle.xyz/8256268792a057d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481676/normal_602e3f9d2ad99.pdfIn PDF document text
    • http://zugasanuko.getenjoyment.net/38340770533.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_602e0068d2f31.pdfIn PDF document text
    • https://fewebiporunivag.weebly.com/uploads/1/3/0/7/130775920/nuxukadelovu-febipepukevek.pdfIn PDF document text
    • https://piwaxokireruber.weebly.com/uploads/1/3/0/9/130969414/6237f176b69d71.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/washington_football_team_schedule_2020_season.pdfIn PDF document text
    • https://kibatujobed.weebly.com/uploads/1/3/4/7/134739754/845519.pdfIn PDF document text
    • http://naturka.space/health_and_safety_guidelines_for_care_homesnviq6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530171/normal_5fe0e929df778.pdfIn PDF document text
    • http://gosunenibunale.getenjoyment.net/cystitis_adalah.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/11th_bipartite_settlement_for_bank_officers.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/28861950585.pdfIn PDF document text
    • http://gevapugono.atwebpages.com/frecuencia_cardiaca_tecnica.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/44461424439.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_off000181d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181D8 5160 bytes
SHA-256: cd4d15b57afdd91b36a752975342fa637104a986fea49c513ac3cc2110f4afe1
font_01_sfnt_off0001935c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1935C 12188 bytes
SHA-256: 51c08d6bca4ce6c4a59d6e4dc67012a7c6f99352e5a9f157da529520f512cd1b

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