Malicious PDF — malware analysis report

Static analysis result for SHA-256 b399df5347996ea4…

MALICIOUS

PDF

76.7 KB Created: 2021-04-30 05:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3f24aa267134fe2655bc036f1dbe70fe SHA-1: 216ac4688bbe28705014249235a01f9837af965e SHA-256: b399df5347996ea4b7c8afa75fc4adcdbfd9a0abfcddef5fa0bd08f5ecf1bdde
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://nipisod.ru/strik?utm_term=what+is+the+best+online+diary PDF link annotation
    • https://cdn.sqhk.co/nifodotiriru/ggTtMjd/bokupejira.pdfIn PDF document text
    • http://gapokaro.mywebcommunity.org/tcc_administrao_publica.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492250/normal_5fe2a3112c9af.pdfIn PDF document text
    • https://fekobuwag.weebly.com/uploads/1/3/1/8/131858403/zobijoxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489241/normal_5fd1e74dbe5e2.pdfIn PDF document text
    • https://cdn.sqhk.co/dukizukijire/Ohj9Ajb/trending_videos_news_2019_showbiz.pdfIn PDF document text
    • http://xufededubumavif.scienceontheweb.net/9166683532.pdfIn PDF document text
    • http://luziniwanemek.sportsontheweb.net/equilibrio_ionico.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369796/normal_5fdaf91c88b37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408712/normal_6052591f23c01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413363/normal_604690f3cddcf.pdfIn PDF document text
    • https://cdn.sqhk.co/posiraki/iecghhj/zajexopeweporavu.pdfIn PDF document text
    • https://rojofasefimo.weebly.com/uploads/1/3/1/6/131636828/wizadijumuvutovog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465914/normal_6038dee9c3955.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419413/normal_6037bffb61ea2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_16e1cfeb46d14390ab4a10b0101ddb46.pdf?index=trueIn PDF document text
    • https://25f35837-e8ad-4357-b490-8f69bec4165a.filesusr.com/ugd/96c61c_c94ea9cff6c04c9ca95d246b8144de80.pdf?index=trueIn PDF document text
    • http://kejagabato.myartsonline.com/rixujagubomadigelopuxit.pdfIn PDF document text
    • https://694dae7a-2033-4a59-8b06-91ff4eec0774.filesusr.com/ugd/e1d58f_d7c7c21de95e402f807f96921c5a19e4.pdf?index=trueIn PDF document text
    • https://e209d09f-5af8-48a0-acfc-72d03e9bea0d.filesusr.com/ugd/946fcc_ac514c264aaf4796a479cb3f9b2c45cd.pdf?index=trueIn PDF document text
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_bfaa2d1d12224798a7bcb3acb0a5612e.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_off0000f1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 5168 bytes
SHA-256: 4369585569da6753bfd682c9bca9cd5b04c92f9c1144d73080dcd1c62bb7c3c0
font_01_sfnt_off0001038f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038F 10192 bytes
SHA-256: 3457d1c653f1509ce2f8a96bec661905939b70df4f82f33a7cb9368b0b428239

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