Malicious PDF — malware analysis report

Static analysis result for SHA-256 401b58bc45a1f8c7…

MALICIOUS

PDF

71.4 KB Created: 2021-05-15 19:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1a1be5d470eca9b6c983c3769d95d1b4 SHA-1: 63fbd001665640f054cd921efa9225a4523d36fe SHA-256: 401b58bc45a1f8c7075e0c2d13d962950689f848c499ca23ee694b0788cae761
126 Risk Score

Malware Insights

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

The PDF document contains a lure related to Vizio sound bar issues, directing users to a malicious URL. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of distinct, low-reputation domains used for hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=why+does+my+vizio+sound+bar+keep+getting+louder PDF link annotation
    • http://prizinsta365.online/59051171063667c2.pdfIn PDF document text
    • http://tobafiga.medianewsonline.com/xezorolulibag.pdfIn PDF document text
    • http://zijixiteluwek.scienceontheweb.net/tegedumuzifetenilez.pdfIn PDF document text
    • https://jokiwuruxuwam.weebly.com/uploads/1/3/1/4/131437523/zofuzo-vasetiwazapo-gisuvugo-dinoxapatid.pdfIn PDF document text
    • https://guvolobojifo.weebly.com/uploads/1/3/4/7/134733869/vexikosito_bulaxidavigeve.pdfIn PDF document text
    • http://vemelaribox.getenjoyment.net/abzurdah_libro_gratis.pdfIn PDF document text
    • https://munelexogetajax.weebly.com/uploads/1/3/1/4/131437313/5802ca1a.pdfIn PDF document text
    • https://masudokunu.weebly.com/uploads/1/3/4/7/134731157/8342829.pdfIn PDF document text
    • http://besefobusim.mypressonline.com/tarimixigenitixatabuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406775/normal_5fcaf5134b840.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492278/normal_606e6f3666043.pdfIn PDF document text
    • http://nexofozupugasi.mywebcommunity.org/lyman_49th_reloading_manual.pdfIn PDF document text
    • http://bufo.online/maytag_maxima_xl_washing_machine_manuallhqeq.pdfIn PDF document text
    • http://lajafago.medianewsonline.com/cricket_darts_rules.pdfIn PDF document text
    • http://giwudogor.scienceontheweb.net/diabetes_mellitus_2020_ada.pdfIn PDF document text
    • http://vexasefagi.scienceontheweb.net/byte_of_python_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371800/normal_60592b8de3902.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jupegojut.atwebpages.com/xufizigesej.pdfIn PDF document text
    • http://dapufojutujat.atwebpages.com/pofawa.pdfIn PDF document text
    • http://seroroxunabolu.onlinewebshop.net/lizosujidadetumexumi.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
stream_002_off0000d90d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD90D 5804 bytes
SHA-256: 9db97b679feb1476172fdc90d24bd810cbaeddf9164bb0f37964f7500ed90a1d
font_01_sfnt_off0000ecc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC2 10404 bytes
SHA-256: ee485e41f8c605ff8fa1c8213fada705571e7daf40891640dd7d270b14381cd1

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