Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6fe12ea38aec531…

MALICIOUS

PDF

87.7 KB Created: 2021-09-21 06:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 32c9542304336ff97eb07bdf14f3d7c7 SHA-1: 9dd545f9df9671626b8fd53070b6a3fa3046b1dd SHA-256: e6fe12ea38aec5312ba3ce5c75aa2cd9e3e7ae9854020a231fe5654da1a996ea
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous external URLs suggest a link farm designed to obscure the true destination, likely a phishing site or a malware download server. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://hanasushichoice.com/uploads/files/83288219872.pdf In PDF document text
    • https://ev-owners.jp/userfiles/files/7122314742.pdfIn PDF document text
    • http://fitviewer.info/files/file/37710176267.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/46846927399.pdfIn PDF document text
    • http://winso.tw/userfiles/file/lunudikanu.pdfIn PDF document text
    • http://alvitraders.com/files/viwekanatetare.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/56677122431.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/971171152.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/15678742156.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/masasag.pdfIn PDF document text
    • http://go-forum.cn/upload/files/93197378306.pdfIn PDF document text
    • http://mc-opony.pl/files/file/zobeniwaligudenezu.pdfIn PDF document text
    • http://julianina.de/upload/file/najunozotefu.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/wutesanodabeg.pdfIn PDF document text
    • http://kdekdyjak.cz/data/xuvurosomo.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141231417ea3---94456206902.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kuluz.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/paforibazur.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/95463407118.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/17122156302.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/wabenavewugopesix.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/joduzotapu.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/dapusaxirovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=mejor+app+para+leer+libros+en+tablet+androidPDF 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_off0000ecc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC6 10648 bytes
SHA-256: ae86e93a569402315b50ad090df8cab8b079fe9415e4d2a296ae726305a5dc72
font_01_sfnt_off000104fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0D 19620 bytes
SHA-256: 35c68e5ac1bf315d4bb726def014e7198ee7ea3be152540f94712e6fc8e509cb

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