Malicious PDF — malware analysis report

Static analysis result for SHA-256 9225b3fd25970661…

MALICIOUS

PDF

78.4 KB Created: 2021-09-20 11:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 350e87883d4432b194e4250457864b75 SHA-1: 7d4bd3ad17065e49bf8c0d5f3724e88d45925c77 SHA-256: 9225b3fd25970661004e09def30e28219625368faf5cb51aa219ad7ea0d46e04
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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://wastran.ru/uplcv?utm_term=go+movies+malayalam+film PDF link annotation
    • https://biocenfis.es/uploads/assets/file/donukewegor.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/33601586669.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/garer.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ragaxe.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/92355934879.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16139e59ce1361---19891045507.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/guzafuzupuvuxewo.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/bifazikibajamobo.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dce5c528c4---71005148889.pdfIn PDF document text
    • https://paradigma.bg/uf/file/13221517863.pdfIn PDF document text
    • http://npas.ru/pic/file/bigefapagafabekologe.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/xifujawalupatavazis.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7825081238.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/musuzanemunilorowivub.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/19724943061.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/derusinemisugubow.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/25723690063.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/1097110756.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/poxitufanuziropedilodim.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1631951521f08402b9900c49b50f97.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/92998450317.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://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_off0000d303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD303 16924 bytes
SHA-256: 935faf9a7b35186c768f5911a42fa1f8c5c75c039006fa1de09a38cb41e0369b
font_01_sfnt_off0000fe4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11663 10292 bytes
SHA-256: 3a977ff2990ee86bf18349ef08cdb0648399dbd5f24ed43a24db4b9b06030af2

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