Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b5030a19a442b2…

MALICIOUS

PDF

76.5 KB Created: 2021-09-25 15:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7db40797ca8aa6407e6ef8f95f2395f6 SHA-1: 15f3f3162c305287bb4028d46ee38bcaac3c0b0d SHA-256: e3b5030a19a442b2e7cd7f1aac2284af857b2bce584772495bc8d5d70f795c0d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and a large number of external URIs, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution attempt. The presence of JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://drafthe.ru/uplcv?utm_term=tamil+crime+thriller+novels+free+download PDF link annotation
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/63968585654.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/23475386458.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/mipinepipatunenuniwafupa.pdfIn PDF document text
    • https://funke.be/data/file/35325747724.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/81598500573.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/rotilamusalejonevej.pdfIn PDF document text
    • http://doanhnhangiaophanvinh.com/images/files/24348894851.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/89923282158.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161347e65644de---33073695530.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/64847825524.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16146d2d84f70f---jimuruxelivumabe.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/88673459179.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/fojonogexu.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/58123458521.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/tonuwekojofefovoreligiv.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/23562377381.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///donujexoregipuz.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/silefefaf.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/fubasoraludafinozalatof.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7761510130.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210924234316932.pdfIn PDF document text
    • http://tobolsk.fluentrussia.ru/img/content/files/zivaji.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_off0000bf1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1A 10856 bytes
SHA-256: 7f191e828e8fc78440ef480de80b8fffcd9da67ed796287d9f885e70aef4fc0d
font_01_sfnt_off0000d810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD810 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF022 19300 bytes
SHA-256: 976df7cba93dc07ea947a94e90b2b69e8042945b5692adf3561bc667cfc28195

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