Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce420b7613a27698…

MALICIOUS

PDF

78.0 KB Created: 2021-03-31 03:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0d80facf063b857e71f308e201d0472d SHA-1: f175af90a083303ee8092b8153e7cb18c3c94007 SHA-256: ce420b7613a27698fe1d7c1a02a870f14f7f5f6ce9d328455d15c96c2fda5f63
244 Risk Score

Malware Insights

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

The PDF contains a large number of links to external websites, many of which are hosted on disposable domains, indicating a link farm designed for SEO manipulation or to host malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=multiplication+worksheets+grade+4+pdf+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380531/normal_5fd37f5316b84.pdfIn PDF document text
    • https://zonisobeb.weebly.com/uploads/1/3/4/3/134333784/molowoko-jopikul.pdfIn PDF document text
    • http://opssmall.space/168527546297b94x.pdfIn PDF document text
    • http://onenature.space/how_to_make_jcb_with_cardboard_sheetwhvtf.pdfIn PDF document text
    • https://juwexulomo.weebly.com/uploads/1/3/4/3/134385858/kufaper.pdfIn PDF document text
    • http://leomannapov.com/definition_dotted_line_reportingvhfkn.pdfIn PDF document text
    • http://basiditdcf.space/powilafipadeparukeguzvor9.pdfIn PDF document text
    • http://glasshookahcatering.com/project_management_book_of_knowledge_7th_edition29uw5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478378/normal_60146c2578750.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416319/normal_605cb6e069fd5.pdfIn PDF document text
    • https://nunoperiv.weebly.com/uploads/1/3/1/8/131856708/wusowelidotepewujo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450350/normal_5fef15db85fb8.pdfIn PDF document text
    • https://xefujalebide.weebly.com/uploads/1/3/2/6/132681694/tekokimode.pdfIn PDF document text
    • http://reduslim-sito.site/858273080977ps8d.pdfIn PDF document text
    • https://mavevataxivira.weebly.com/uploads/1/3/4/6/134600118/wusodutexe-sasavus-norilarefidoj-pajelulop.pdfIn PDF document text
    • http://reactivaperu-viabcpi.com/haunted_tunnel_car_wash_lincoln_neqo42v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_e91ea1ddaeaf411bab963cafad656d94.pdf?index=trueIn PDF document text
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_9eda0df2429445b48ac8e50497c11c63.pdf?index=trueIn PDF document text
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_f51fc5ba97ce41a790df6e864357a829.pdf?index=trueIn PDF document text
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_51d38e12659e4efab3101183e7725471.pdf?index=trueIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_4dbbcc9d9d1f4f0197b13f1e956b8cb2.pdf?index=trueIn PDF document text
    • https://933afb0c-60ca-4ff4-ba38-e7c804ca925d.filesusr.com/ugd/941881_03f84a83b8fa4676b1410425efe50b9d.pdf?index=trueIn 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_off0000f36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36F 5664 bytes
SHA-256: 13fb532ba3435b88765b829d6aa92b6d76b18b638dc11e2015cdea819c53e770
font_01_sfnt_off000106d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D2 10424 bytes
SHA-256: dde99c1197d39dd2b904ebaebe96725cdec8aa2394d6cef47f827c4c0bbc4384

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