Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e5b6c0f8510fd9b…

MALICIOUS

PDF

76.8 KB Created: 2021-03-23 10:22:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9bbaefa60b9ca400da25a502d46a5113 SHA-1: 59837b9c8126fb1b580ee049077f23d64d953ca4 SHA-256: 2e5b6c0f8510fd9bd0bef393ae1d55699bd091126a199f4055e5dc693672aa50
156 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 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 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.
  • 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://maypoin.ru/strik?utm_term=independent+samples+t+test+apa+write+up PDF link annotation
    • http://ruwemipuwev.mypressonline.com/zejizafujizusev.pdfIn PDF document text
    • http://kovafuwir.getenjoyment.net/assembly_language_programming_basics.pdfIn PDF document text
    • http://lasiwefomibew.sportsontheweb.net/gate_instrumentation_books_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_a7bc6a6f56444662a2c432461152499f.pdf?index=trueIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_5105ec4f30754732b47e2730d3941943.pdf?index=trueIn PDF document text
    • https://a44a9d9e-3ce9-422e-9b5d-83ef2d4925cb.filesusr.com/ugd/3234e9_e044b168f28647c7a587a77d28b96e73.pdf?index=trueIn PDF document text
    • http://teropisarazo.myartsonline.com/80539632405.pdfIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_38fff4a5dda549119d032cf6660aca84.pdf?index=trueIn PDF document text
    • http://mepitar.atwebpages.com/20986296258.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/bluestacks_1_for_windows_8._1.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/year_1_maths_worksheets_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/paxabamodasapimura.pdfIn PDF document text
    • https://8ee4d174-735f-4cd7-9396-c3a65dbcc337.filesusr.com/ugd/5ac313_a460d0089b474ad899e7bb9fc661e93a.pdf?index=trueIn PDF document text
    • http://vekisofekibote.myartsonline.com/85265803146.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/akon_freedom_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/29320085039.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/litakeso.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/8393430245.pdfIn PDF document text
    • https://882e4f53-a7e1-4d4a-89e8-a6e6d9f9b805.filesusr.com/ugd/9a13d2_bf34b1641f5e42f7a5f4dd3065b9c25c.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_off0000ec09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC09 5136 bytes
SHA-256: 2f15a1fb1d455062447fbf536662bd497673564fbe23cfa0432561c0e7975a01
font_01_sfnt_off0000fd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD78 11668 bytes
SHA-256: 7b9f9eb1993130739c0caf7d8b9e8cc5a3270bde74b546c1168015ad41847b0a

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