Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d57bf52a5018614…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 03:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ef5e29ea8bd8a828de382d66f671e126 SHA-1: e68b2812cdf3ddc6656f8bcf6b5127f1ad0fd3a5 SHA-256: 6d57bf52a50186144518d631fc9b7cb59f015362caaece192617d26bcc0eba3e
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 disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. The presence of embedded JavaScript (T1059.007) suggests it may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://yourbuilding.ru/userfiles/files/71855960491.pdf In PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/75207230404.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/pasejomadofijifevu.pdfIn PDF document text
    • https://susta.vn/userfiles/file/5754774941.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/84120781795.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/nugisepozobajemar.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/dufetukorikizeduduzub.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109022309001475.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/84552114738.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/fejumonifojun.pdfIn PDF document text
    • http://minipit.com/data/files/15702294138.pdfIn PDF document text
    • http://446888.top/userfiles/file/98753119025.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d875d189cf---61640886474.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/48976876572.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/wogipiwudetowirosopur.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/76904990775.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/50492447081.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/fpi3db6a6ibeuejbver44gc0bc/puvimeg.pdfIn PDF document text
    • http://icareonline.net.au/ckfinder/icare/files/domobebejodutasowotob.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tabuzigadopasesav.pdfIn PDF document text
    • https://tl-systems.hu/files/files/nowat.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/88498765367.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/ponira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=minecraft+free+trial+multiplayerPDF 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_off0000d8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DD 17260 bytes
SHA-256: 9283d8c610e3f9501c8ec591c8172d61ea2c3e2af9d98d793b6fc511369ba3d2
font_01_sfnt_off0001055e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D75 10560 bytes
SHA-256: 3300195218861ac087f51bb08f65c96d2573c6fd44b3b7c34d0f3c72fbdcd11e

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