Malicious PDF — malware analysis report

Static analysis result for SHA-256 baedaa4345a7e387…

MALICIOUS

PDF

80.9 KB Created: 2021-09-19 02:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8da619cac4e7e462346daee3b03915f0 SHA-1: 5da6ae52b996d204a9649f038134503c2c4a37ef SHA-256: baedaa4345a7e38757469e7eabd242fc8656bd9597a162a538a6a5ad0a208c27
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final malicious destination through a large number of links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://huntic.ru/uplcv?utm_term=how+to+change+android+lock+screen+wallpaper
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/xapojoxafuk.pdf
    • http://konsultacjenaukowe.eu/Upload/file/51427241554.pdf
    • https://xn--psg-9lac.hu/files/files/lezovepezifaxilidas.pdf
    • http://homelife-superstars.com/image/files/2128485829.pdf
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/jitisejutidenawaf.pdf
    • http://albertopizzetti.it/userfiles/files/94637800766.pdf
    • http://alothongtin.com/upload/FCK/file/66031486850.pdf
    • http://projecthouse.bg/uploads/CKfinder/files/zudetadili.pdf
    • http://fine-cottage.ru/userfiles/file/30639211462.pdf
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/bisonawobopubevon.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/a41279ba5bc1bb81114802f23a043a01/pominiwoviz.pdf
    • http://massimobertoarchitetto.com/userfiles/files/rimana.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bafa76169c---57125194482.pdf
    • http://vagtteam.com/userfiles/Files/16196790917.pdf
    • http://vivo-mebel.ru/upload/file/11189053176.pdf
    • http://alptw.com/images/files/foxazorebojabotedik.pdf
    • http://indigobaby.eu/upload/files/zabek.pdf
    • http://vngo-cc.vn/cooker/public/files/dimokanefonukem.pdf
    • http://sushibelovo.ru/files/lexuwosuwopisepomot.pdf
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/vetumunowup.pdf
    • http://sahamit.net/userfiles/file/zexodajes.pdf
    • https://dcimx.com/files/64313923100.pdf
    • http://aaykpn.com/uploads/editor/files/jikopevexuvisaj.pdf
    • https://cdmsig.com/ckfinder/userfiles/files/puxukexomenabamagipin.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da27.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA27 16792 bytes
font_01_sfnt_off0000f239.bin
d86cbbf74dc11679b0dba982b7ad5c73eddb8ca64b55f3b809458dfa2e962601		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF239 16280 bytes
font_02_sfnt_off00011c35.bin
293cd56e8692c18c566442ce91d863cda4186f70bfc363e15135bcbf40e382f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C35 10960 bytes

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