Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0a3ea7a1788226d…

MALICIOUS

PDF

71.8 KB Created: 2021-10-06 08:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ad229c9e883ba5074252eed9ce44746f SHA-1: ae4c90d38e3b77ae3ced8541aea482fe3652cf4a SHA-256: d0a3ea7a1788226dc0756c2d0972c9c2a6ededceee56c849d0efa7e91f0e3405
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious or link-farm domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of JavaScript suggests an attempt to execute code or redirect the user to a malicious site, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://studio70.eu/userfiles/files/tajisi.pdf In PDF document text
    • https://acryl-bg.com/userfiles/file/xaxofisajametatafabi.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/70754181751.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/pesotig.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/80481072258.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/8723221068.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/perarim.pdfIn PDF document text
    • http://szm.hu/userfiles/file/xujobopibiwevesobe.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/ridejojokufovidejusijimo.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/luvekowixovu.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lubekulanixoledi.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/nixitagoxe.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/gelezedulo.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/kigagerat.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/18295410134.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/nobamorag.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/6199997714.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/50974982011.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/vaginedub.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/roxufofafevigetuzelegozu.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/73442771029.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/vevegabeseti.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/zutunufebikuxifo.pdfIn PDF document text
    • http://abc-tel.ru/data/File/junupejilej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=gta+5+jay+norris+stock+investmentPDF 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_off0000b643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB643 10920 bytes
SHA-256: f3034f7b6803ea57cafd51516c9ce504447640236a6268514b9fefacc0eacec0
font_01_sfnt_off0000cfae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C0 16432 bytes
SHA-256: 632355f894c81ced75edaa29dd18cb4ff2f152482a7a7c204d9d169e64c85156