Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b27d966c58e6dc6…

MALICIOUS

PDF

84.4 KB Created: 2021-09-12 09:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1966a7939be4eb6147f2dd54bc2a10ab SHA-1: 90992bd2a383ff6b294952b5799848c216ed55f6 SHA-256: 9b27d966c58e6dc69e0a985b0faec5cbd7f3eff0418cc2c5b213e18b9bae464e
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to download and execute a secondary payload. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=tvtap+pro+android PDF link annotation
    • http://stapper.de/sites/default/files/userfilesfile/xamagudalixafik.pdfIn PDF document text
    • http://findacommodity.com/upload/file/86544337265.pdfIn PDF document text
    • https://csodamalom.hu/files/files/refanoneredomaxob.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/tamopirozela.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16132fa5458e9b---32861943612.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/64046546713.pdfIn PDF document text
    • http://lse.hu/userfiles/file/negijuvevip.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/kamilibib.pdfIn PDF document text
    • http://indemo.pl/Image/files/17495942924.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/nizewodidufunituweraf.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/74518826164.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/kozewoxikiguwogozofur.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/46cb8f81497d94e0e7db0b7d9ce3b12b/kudaresemofemijeloxuv.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/ramamejovavebefo.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/tigowexewibakaxovozig.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/molobituvakemuwinirip.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/tisofusabukugimelegalo.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/fujewuwetotokodozole.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/jamoj.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/87664945873.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/banopugi.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/fonabubamekinamutapopusi.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/15384256018.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/zabeniwaroxotikuwupiso.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109011609259066.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/4439958990.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/7419263724.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/51717331326.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_off0000e7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C7 10068 bytes
SHA-256: 1f4f1ae973a52cf28871a030c361ae521b671d322f444275e0436756060e31ca
font_01_sfnt_off0000fe41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE41 17680 bytes
SHA-256: a349052cbfaab78ad4a9f3bfad36e6ba5ed412238b2486c201d21de89d4b0798
font_02_sfnt_off00012bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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