Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eb68beb2ec3eeaf…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 21:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 08a65f3c68d8c8af323fbdd595ad64bf SHA-1: e5e91159900dd1327b378cfa8e6ed0ffcd99a67c SHA-256: 1eb68beb2ec3eeaf0cec1eac58af6e4b33abc70d3c51b067d679b8d56a396fc4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of JavaScript to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://philabc.ru/uplcv?utm_term=c%23+unity+game PDF link annotation
    • http://tw-echen.com/uploads/files/202109091618501128.pdfIn PDF document text
    • https://codecs.ro/images/file/xuxijoduxemetejogujamow.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/45040865454.pdfIn PDF document text
    • https://cargotavio.ru/files/file/7302992141.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/ferewinamarepiwaz.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/jojawexi.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/supitejuzebojir.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/44697607948.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/19930296975.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/59215327528.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/mizikumomasuze.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/29757484526.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/jowuzexutoligonetegibuwe.pdfIn PDF document text
    • http://slovoveri.org/userfiles/babowebasebamiselupibolo.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/juwefazirimemotopimanu.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/gadunima.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/o6d1508mqsv1j44q6r30j429ho/15247020516.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/27616270331.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/kikefugowividubuwevoj.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/sekuzusodadutomuronenukos.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/dilidiraxol.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/jisekazesexebozo.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/8965318478.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_off0000dbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC9 9104 bytes
SHA-256: fe4a9ad32d6d12da45ce8861a1e6e511df5579fd33367a5c4d1c9e774d301804
font_01_sfnt_off0000ee96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE96 17396 bytes
SHA-256: 1956e5816f68db4c605b5af7bce479a53e6eabd4bcc1038c875b36ff8f7a8e1a
font_02_sfnt_off00011c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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