Malicious PDF — malware analysis report

Static analysis result for SHA-256 123549aa91fae3fc…

MALICIOUS

PDF

79.4 KB Created: 2021-09-16 02:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 859af2205479254ef2ed90f049e9957b SHA-1: 5969834916d2118e4d21eebceccca2ba998fe2c8 SHA-256: 123549aa91fae3fcae098aedfe94a22d2f5fa5ba9c5d6f8ca89af367da86470a
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are part of a link farm. The ML classifier strongly indicates malicious intent, likely to redirect users to malicious sites or exploit vulnerabilities. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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://pixomot.ru/uplcv?utm_term=if+clauses+exercises+pdf PDF link annotation
    • http://debnine.net/UserFiles/File/33185708735.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/disunite.pdfIn PDF document text
    • http://boxethai38.com/upload/file/folegevodafotire.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/tegumulujomilutudeb.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/xuxagodijisolixev.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/pimovirexed.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/97652918781.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/vulamotikoxukoworoke.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/jopesedu.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109080051449318.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/4298507934.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210913020104.pdfIn PDF document text
    • http://llux.vn/uploads/files/467521359.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/22834031555.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/xolafafubibal.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/27799946807.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/69230042910.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/negadutilizisuguwo.pdfIn PDF document text
    • https://shevian.com/images/file/wawujuke.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161355bb957a67---23593405981.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/65440012687.pdfIn PDF document text
    • http://cissi.it/userfiles/files/30859657703.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_off0000cffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFC 18436 bytes
SHA-256: 3364e815b10f884c88be6a1b3a95eb753bf8cdeb01dc6ae4579017688fb6019e
font_01_sfnt_off00010022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10022 10444 bytes
SHA-256: 39ec01a0cc93b7fd0711c2e36328d172acfb7b7049c187622f388228f03e1791
font_02_sfnt_off000117ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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