Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b712fd772160bf5…

MALICIOUS

PDF

74.6 KB Created: 2021-03-12 15:52:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: cd8bb7f12f6313e54201d49eae6c246b SHA-1: 75297a3366a72ee36586a1208a26fe24dcf4974c SHA-256: 4b712fd772160bf5f4020de9eb731799b49ea1eab174e9cf0464ce6bc2cf9b2f
186 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://maypoin.ru/123?utm_term=preposition+worksheet+pdf+4th+grade PDF link annotation
    • https://cdn.sqhk.co/xasexuwosul/gjkmjg6/pizzaiolo_pizza_north_babylon.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/38900051087.pdfIn PDF document text
    • https://davugunibelerab.weebly.com/uploads/1/3/4/6/134612729/6666792.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443326/normal_5fcce7449431d.pdfIn PDF document text
    • https://zekaxuwamawebi.weebly.com/uploads/1/3/5/9/135961115/zulorixabukigiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453108/normal_601aeec230e7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388407/normal_601d925019398.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_6031999a53a4c.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/faliredumexufovazige.pdfIn PDF document text
    • https://cdn.sqhk.co/dizukenepu/ghcihjd/betazokodekozefo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454677/normal_60400c1252346.pdfIn PDF document text
    • http://leziwazedo.mypressonline.com/st_francis_retreat_house_easton_pa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462368/normal_600aa39becd9f.pdfIn PDF document text
    • https://cdn.sqhk.co/pogezasamu/hcgiieL/94239205690.pdfIn PDF document text
    • https://cdn.sqhk.co/tisojubew/dL8Njgj/battle_angel_alita_ova_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416654/normal_60119aff574e8.pdfIn PDF document text
    • https://rabizelen.weebly.com/uploads/1/3/1/4/131453176/babularujapu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duribolatajofa.atwebpages.com/i_am_discourse_st_germain_1-33_complete.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_off0000e68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68F 5516 bytes
SHA-256: 9b67f9853a7e5b8ad079a6676e7dcfb7750c2caf61586c42cac400ccc71a152e
font_01_sfnt_off0000f968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF968 10504 bytes
SHA-256: 71e62ada96a3507f93588c60d5480a0adaccb0670545ee412a07d0efdd792042

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