Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd0b107040a91cd…

MALICIOUS

PDF

69.2 KB Created: 2021-09-17 09:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 841e6e6836f2e226ec68a9dbdce87e8b SHA-1: 4aee63967f06afb1317c441ec7a96af998d7c51b SHA-256: cbd0b107040a91cdccf47562aa250279d0fa1d93d6bbaef0bad37ddeee914bb2
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 ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects to external URLs, as suggested by the PDF_URI heuristic, which is a typical phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://gurgaontaxi.com/pa/trainstation/uploads/image/file/pasulelalili.pdf In PDF document text
    • http://pk.mo/userfiles/file/44252709885.pdfIn PDF document text
    • http://ranch.pl/files/file/tazeziwijidajo.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/27242939414.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/15411127765.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/47667078447.pdfIn PDF document text
    • https://coevent.ru/upload/files/didin.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/80640099547.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/seforiserebegu.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/11626153153.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/84877791547.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613469bac293a---dagipasokitu.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/piwerona.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/kozun.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/jexebesegefubawop.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/38996075189.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/zerekabivumolujigemegowi.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/57992520109.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/fidinovupogilakovesibotav.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/91359991480.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/13374647278.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/bezokuwugebosebapefakol.pdfIn PDF document text
    • https://phunhai.net/upload/files/sisuranebexuvizuvom.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/nabamelemaloji.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/jezugalidudixudefevobuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+get+free+keys+in+choicesPDF 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_off0000b1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C2 10688 bytes
SHA-256: d8c0fa38f5d8141926070985712127b614637c25b8429bde67472e2a8b381150
font_01_sfnt_off0000ca41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA41 14664 bytes
SHA-256: fa4905203365b0a33a882db0fe3a9ac54552acd5705e5e1ae80d00b9c8d8f2e2
font_02_sfnt_off0000ef48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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