Malicious PDF — malware analysis report

Static analysis result for SHA-256 29a8e22aa1f57e78…

MALICIOUS

PDF

74.8 KB Created: 2021-03-02 06:32:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3b49b0b7e724c91fc8f55d77a6f8085e SHA-1: bd453a6827dae1a12e35c0185bdc14809113004b SHA-256: 29a8e22aa1f57e787921edb0aa350f923644c4ab20d881cfbe4184bbddeb2113
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://baarspo.ru/wix?keyword=electron+configuration+practice+worksheet+answer+key+pogil', are likely used to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/wix?keyword=electron+configuration+practice+worksheet+answer+key+pogil PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475999/normal_5fc87290d7661.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385853/normal_5fe74e29978c9.pdfIn PDF document text
    • https://takesefitetipal.weebly.com/uploads/1/3/2/6/132682925/sumepuxi.pdfIn PDF document text
    • https://fuvufuraw.weebly.com/uploads/1/3/4/7/134745886/nukapusikuzegawi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369143/normal_5fe1d8a27fd8a.pdfIn PDF document text
    • http://abanca-electronica.com/dollar_store_deals_canada1tt5w.pdfIn PDF document text
    • https://xagigerabep.weebly.com/uploads/1/3/1/4/131483632/sozixufoge.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460694/normal_5fe4b97c54f7a.pdfIn PDF document text
    • https://forexegazujolo.weebly.com/uploads/1/3/4/1/134108883/banosa.pdfIn PDF document text
    • http://mazafaka69pussy.online/lethal_race_juegos_frivt8h2t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471095/normal_6029084fdf885.pdfIn PDF document text
    • http://olivamebel.com/agar_macconkey_fundamentoson2l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447270/normal_60158bf0a0463.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/zemigiduwagafu/37044601593.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxegu/wuxowuxirifilawugif.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/99961791187.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_off0000e7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DD 5492 bytes
SHA-256: a819272993aab2f2693795820cca2e51b2541518abdef7ce94d1436690836609
font_01_sfnt_off0000faa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA9 10184 bytes
SHA-256: d061ba06b879e60f885908e9fd860b1c2269167563811e8f35c60172be9e252a

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