Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae971df94f5f83b9…

MALICIOUS

PDF

72.1 KB Created: 2021-03-12 15:57:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b44914cefde6b965e9565a55989339dc SHA-1: 2875d42b4fa626655ecab4b958c415c98f22d476 SHA-256: ae971df94f5f83b9de23b2c6fda1983cba6c6c6eb328b63726043c096bcaa2c6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links, likely for phishing or malware distribution. The primary malicious URL identified is https://kuzutuzo.ru/wix?keyword=ff14+snowcloak+tank+guide, which is likely used to redirect the user to a malicious 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://kuzutuzo.ru/wix?keyword=ff14+snowcloak+tank+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453560/normal_602f48b722e5a.pdfIn PDF document text
    • https://cdn.sqhk.co/dutimapo/Ejco6hj/kupiwavokeri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384820/normal_60355850e94fe.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/wegmans_catering_menu_2020.pdfIn PDF document text
    • https://gogukosujupubof.weebly.com/uploads/1/3/5/3/135317205/belixuzusib_folitusavatori.pdfIn PDF document text
    • https://cdn.sqhk.co/banuluwopote/hijsChi/assistive_touch_for_android_premium_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448718/normal_6020c1ddce40c.pdfIn PDF document text
    • https://ganepivojo.weebly.com/uploads/1/3/4/7/134774155/kugoseb.pdfIn PDF document text
    • https://cdn.sqhk.co/tirekidifole/ieA8gi9/migivevarowukap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424010/normal_604ae9f29424e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427103/normal_6045886b45712.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/IOihicX/pimifusiwanubizifovoli.pdfIn PDF document text
    • http://birebap.scienceontheweb.net/56563752929.pdfIn PDF document text
    • http://kevifiregerufug.scienceontheweb.net/jbl_flip_5_review_youtube.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/wupiwupiwot/28212548294.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/age_of_civilization_2_android_gameplay.pdfIn PDF document text
    • http://xejawaji.myartsonline.com/zatijafokuvemaralakufev.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/pimejowenilidigex.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/88609193031.pdfIn PDF document text
    • http://bigapenegig.atwebpages.com/briggs_and_stratton_675_series_pressure_washer_carburetor.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/26772470847.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_off0000de39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE39 5344 bytes
SHA-256: c6f4e5a6fb56306316c909ee506ebd75aa4f6230893c50b66e2049170920a017
font_01_sfnt_off0000f0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A3 10184 bytes
SHA-256: d37345c8356310c2959476e1544f00f5e916cbae0bf8ab7ff1a911f88f285a90

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