Malicious PDF — malware analysis report

Static analysis result for SHA-256 90fe1daa8cbec045…

MALICIOUS

PDF

81.7 KB Created: 2021-09-08 23:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db798064c132a4d17178371c1efad304 SHA-1: ddb3395028b24fae3c6caeae16ab9994f7a41db9 SHA-256: 90fe1daa8cbec0452e365086d450b13dd96820ffff777bb72674876a4f91eeb2
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, many of which are part of a link farm on disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to exploit vulnerabilities or lead the user to a malicious download. The presence of embedded JavaScript points to its use in executing malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=fishing+rod+mod+apk
    • http://etalentlink.com/uploadfile/file///2021090407534753.pdf
    • http://rooptex.com/uploads/34505228096.pdf
    • https://tekdalyapi.com/upload/ckfinder/files/posodevezulisavimune.pdf
    • https://sadex.pl/fck/file/96303716301.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/b74bb4521b6046b4854b453c623430e3/muwikegitesavuwozol.pdf
    • http://f1-rennsimulatoren.de/userfiles/file/9769054610.pdf
    • http://krevue.cz/UserFiles/File/matuzowiriw.pdf
    • https://bruceautoservice.com/files/file/7582089979.pdf
    • http://ztkammer.at/uploads/file/7023580021.pdf
    • https://alirezamirmohammadi.com/images/upload/files/rapetisejamarajotutalume.pdf
    • https://hsse.hssanesteban.cl/files/45872526242.pdf
    • http://1day2night.com/UserFiles/file/24617033726.pdf
    • https://100tmt.com/uploadimage/files/20210901122950.pdf
    • http://thucphamchucnangmy.vn/uploads/files/gowubuzo.pdf
    • https://hunglivet.com/uploads/files/202109040709563566.pdf
    • https://west-holding.com/userfiles/file/94516983185.pdf
    • https://leanuslab.com/UserFiles/file/refikeponuge.pdf
    • http://chataphan.com/file_media/file_image/file/tumizutobal.pdf
    • https://jokerprod.net/userfiles/file/kuroxuzaponaregumerezifug.pdf
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/89979255775.pdf
    • https://dbjadow.pl/attachments/file/gipovifaveguliravun.pdf
    • http://karpatskiles.ru/store/file/64106822090.pdf
    • http://lavalnerina.it/userfiles/file/fopewibaboxafivejoxezu.pdf
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38997944044.pdf
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/91906607026.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_off0000da7a.bin
1b81368a9260670802ef304840ef03f69cd8243fcb08c927f4de44fbc9642b72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7A 18148 bytes
font_01_sfnt_off00010973.bin
f88fad89cc703803a1d9d835b3f78df1af806cece1647662318b5b323bc2da82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10973 10632 bytes
font_02_sfnt_off00012148.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12148 16792 bytes

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