Malicious PDF — malware analysis report

Static analysis result for SHA-256 7102de2aaf63d989…

MALICIOUS

PDF

81.0 KB Created: 2021-09-12 10:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4f7245d6e3621f2328e3a25741b65b6c SHA-1: 0a9ef61ce3d2b3fc5e881a960dcc68b6c1710432 SHA-256: 7102de2aaf63d9890d5dc8b8da8557ce542bbb76d7305b839797c36881ab41ac
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to PDF files hosted on potentially disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JS suggests an attempt to execute code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://cowik.pl/upload/92846391406.pdf In PDF document text
    • http://canxetaidientu.com/images/file/razuxewirizezirob.pdfIn PDF document text
    • http://opersan.com/file/pusolejudodulimegevute.pdfIn PDF document text
    • https://remini.hu/userfiles/file/10709198883.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/dutivup.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/55405954983.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210902103517.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/wozetamapum.pdfIn PDF document text
    • http://termocity.by/pics/files/7852821043.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/91605978651.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/robokewezuwowogale.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61565817552.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/30622470939.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/varixopusuzolib.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/15778072964.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/b471abad71a0536dc59787cb502b9be1/11138556612.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/pupinefikurexenifuvifokap.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/movonosirudiji.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/revizoli.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/83786539888.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/91581090472.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/turoruki.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/33633298864.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210905070634.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/5314un98lg3nmacmmro9faf3g8/lapugiwuperidisovasex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=survival+island+xbox+one+seedPDF 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_off0000d823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03A 10628 bytes
SHA-256: 0ac9845d37a83aa9d19bd22c1094abd7ed499802f4853bf6ee70e03588704efa
font_02_sfnt_off00010890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10890 17700 bytes
SHA-256: 9ae7b95019e69c517e342bf50facd8d865d0e39b4782879adada6d40aa9c90fa