Malicious PDF — malware analysis report

Static analysis result for SHA-256 81600ea5ac442ecf…

MALICIOUS

PDF

81.6 KB Created: 2021-10-12 05:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d4c1229d4b5ace4b364b8f7725b2bfe8 SHA-1: 8dab09d01f8a435d0cab2b6f8445eecaeac954b7 SHA-256: 81600ea5ac442ecfdf6b659feeb0ca661a6f5fb7f3b82bedc6d3f86bd7359766
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to suspicious PDF files on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for initiating contact with these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://newsru.md/upload/userfiles/files/losukitodewavopuj.pdf In PDF document text
    • https://hyosungulf.com/uploads/file/97676856348.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/3942779284.pdfIn PDF document text
    • https://on-the-markmarketing.onthemarkmarketing.com/userfiles/file/luvinejajejujodobuwulozob.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/dugugonedozenupodikib.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161557543bcc66---25017441059.pdfIn PDF document text
    • https://anaksemut.com/contents/files/31752187735.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/19131396539.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/78603523830.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/lomododuzubogaxirafew.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/92902589204.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/40662539134.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/24477684829.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153be3ae1b7f---jasexapux.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/39623791117.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/58517772851.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/zizulose.pdfIn PDF document text
    • https://foulardfotografando.it/file/zuxebibetezobufox.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/24213594952.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/4384954407.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/lejupupodulatad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/KGDyd8lM0uI/uplcv?utm_term=how+to+thaw+frozen+foodPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75A 10284 bytes
SHA-256: b0b2a1addd1696a63ab7cbf7d1aef5a5a609e5901f658f93b04840473d9fa8d5
font_01_sfnt_off0000ee7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7C 19404 bytes
SHA-256: 3376df75ab6456a251ca75b35388b388f07557aa60bbcc79d0d6c24db3cadf9b
font_02_sfnt_off000120d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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