Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b52966310e659d…

MALICIOUS

PDF

67.5 KB Created: 2021-03-22 07:06:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2dfc6ed83815f8e1226950340a8de6b6 SHA-1: 8b6a4c21d1ce9d855643c15503b406ac2615df4f SHA-256: e4b52966310e659d280c7c97f249b9e00104cd5e2d375fc3867106ba832f9a29
186 Risk Score

Malware Insights

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

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 0.9998

Heuristics 6

  • 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 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://resalured.ru/wix?keyword=quadratics+quiz+1+answers PDF link annotation
    • https://mokugutareno.weebly.com/uploads/1/3/1/6/131606089/tazetub_wesezug.pdfIn PDF document text
    • http://zexejodubaxiku.mygamesonline.org/canal_atrioventricular_completo.pdfIn PDF document text
    • https://tariroviwobin.weebly.com/uploads/1/3/4/7/134715354/xupikutaseruga.pdfIn PDF document text
    • http://sikazigazes.mypressonline.com/79001884715.pdfIn PDF document text
    • http://gosunenibunale.getenjoyment.net/curso_aprendizajes_clave_primaria.pdfIn PDF document text
    • https://jebezijako.weebly.com/uploads/1/3/5/9/135964749/lujadizum_gazesopikeda_bapegijin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_1dd1804260064fabab2c434a4139b5aa.pdf?index=trueIn PDF document text
    • http://nakarajibap.myartsonline.com/gorud.pdfIn PDF document text
    • https://926da24b-d3df-4aea-ac1b-ebdf7359a9e7.filesusr.com/ugd/fef925_f131b226c694454f8df8e94430ca10dd.pdf?index=trueIn PDF document text
    • http://nixomirorubu.myartsonline.com/holy_quran_written_in_arabic_free_download.pdfIn PDF document text
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_c2553f5a01ff44da857d44a6e5018e24.pdf?index=trueIn PDF document text
    • https://54e283d8-6946-47af-b6e3-c78582312647.filesusr.com/ugd/22cd47_16d2680432a14ab19cbb76cda6ea65a6.pdf?index=trueIn PDF document text
    • http://xasagode.myartsonline.com/zuwazine.pdfIn PDF document text
    • http://zitulogakapede.myartsonline.com/dugoku.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/xevuwomufofexekisorozipoj.pdfIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_4df2d928a6104bf19a8d2c5131b7fc79.pdf?index=trueIn PDF document text
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_a097116e5c1e49a08d612af116691f7c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazawojob/budodiminedawebola.pdfIn PDF document text
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_2c3bf971ad1049d9bd31f9e0c8f81545.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/effect_on_environment.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_off0000cc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8F 5280 bytes
SHA-256: ed62dfc9f5edd6b04eafaad7ed4b3e4ee97a3c79fcca1bae3b2cc17aa28f8de0
font_01_sfnt_off0000dead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAD 10000 bytes
SHA-256: 7b32748a7f8f8995ed50e33475ee10d9fdbcf349a40ee59adbd5b9c3f82afc9a

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