Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa0e9872fe89b3a…

MALICIOUS

PDF

74.9 KB Created: 2021-09-20 04:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 916d6c71ed747db9e2c5322a3b6f1572 SHA-1: d24663fbb47246c317e81992ccb434ea9b50e784 SHA-256: eaa0e9872fe89b3abdf3920e5dfbdbe4bf46226a9e72bec57e3ff515d6f20d92
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 disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, and ClamAV detection as Pdf.Phishing.Trojan suggests malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nofatrans-int.com/userfiles/file/dujixawuwadejag.pdf In PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/davumelubawerimonipafalu.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/vapukotefeduzuluvovuz.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/tarivusebamipelemewutepi.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/ketemaripafesixodapev.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/4086434395.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/12367122367.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/66497822335.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/31525434998.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376689a16e4---tototaviwomab.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/60029134768.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/kofelalawajitolaje.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/vebumijuzoxegivod.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021092006510173499.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/68389954727.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/18522430402.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/waxirewojunas.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/36641681083.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/kakiparuwo.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/ropakasomosi.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/leruwo.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/94091444696.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/fafuku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=haikyuu+live+wallpaper+laptopPDF 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_off0000bf07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71E 10424 bytes
SHA-256: db27722de76d80da5835f271ab9b2562d0041c58b95e780f785dd3c9a180632e
font_02_sfnt_off0000eeea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEA 18120 bytes
SHA-256: 9e71d68e0dbdcab9c2e0bc310bbf5e8b10cb4bd760df04925359d15f174fe2e2

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