Malicious PDF — malware analysis report

Static analysis result for SHA-256 c64b8ba0857af510…

MALICIOUS

PDF

86.3 KB Created: 2021-09-17 00:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37ca1131ad2c7e0e03e0a350b6a1f46e SHA-1: c3b3d3e93747380180f57f4e4cb58ad5c49106a0 SHA-256: c64b8ba0857af51039cb20998f9e82e4f5297914e8ebf5022d1b8e9002805db9
134 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 point to disposable domains and are structured as link farms. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=android+recovery+reboot+system+now
    • http://kaizousha.com/js/upload/files/74573111356.pdf
    • https://mepho.hu/ckfinder/userfiles/files/82088358731.pdf
    • https://kaplaitalia.it/userfiles/files/vusinesumimun.pdf
    • https://vibingvibes.com/userfiles/files/bobejanadepuditinenefu.pdf
    • https://pomacanthe-art.fr/imagebeforeafter/files/25799704061.pdf
    • http://www.ez4parcel.net/upfile/files/2021/09/17/noralid.pdf
    • http://apnm.indexint.net/ckfinder/userfiles/files/makalurezufipal.pdf
    • https://mehfermobilsaglik.com/userfiles/file/genamufokedalarapuzi.pdf
    • http://emekyesiltepe.net/images_upload/files/sikogujefazukidesufuv.pdf
    • https://brawlcall.com/ckfinder/userfiles/files/29041746172.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/14nl5h609okmqp147nuk273fla/xovupalisimimonureno.pdf
    • http://porpora.biz/imagenes/imagenes_contenidos///kerexerukawavizigoja.pdf
    • https://kotata-zlin.cz/obr/clanky/file/minibewed.pdf
    • http://jeanthompson.nl/ckfinder/userfiles/files/surikananeluj.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303f2a8447b---23076260679.pdf
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/16395575625.pdf
    • https://daotaolaixesontay.com/uploads/file/11997444313.pdf
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210905_180051.pdf
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/39620057323.pdf
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210914054634.pdf
    • http://kme-kme.cz/files/file/rovapedunu.pdf
    • http://wefocusdesign.com/upload/files/49136251851.pdf
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/setovafivubelu.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_off0000eb85.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB85 16792 bytes
font_01_sfnt_off0001039c.bin
bc2680792cf50af6a14e80fbf103c7a76d84b5ea1b03cb16f75668a90ef941b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1039C 10708 bytes
font_02_sfnt_off00011c40.bin
11d6031f5ff84daefc296a6d47ae2c849a03e3c991365d74478ee3d2301060df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C40 18284 bytes

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