Malicious PDF — malware analysis report

Static analysis result for SHA-256 400b2d704c50736c…

MALICIOUS

PDF

89.5 KB Created: 2021-09-20 20:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 507e66acb8c9ea891cd4d497df82697c SHA-1: 0708bb6e7e87dde5c6009b4be07c0853952a899e SHA-256: 400b2d704c50736c16d9af6ec4f45e78c5241a8d2be7825fa597987110436b44
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file with embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It also contains numerous external URIs, many of which point to potentially disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://flapboxes.com/userfiles/files/nipizavejimum.pdf In PDF document text
    • http://regalmotors-jp.com/js/upload/files/88721818472.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/21542815136.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/10452845428.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b2a604099---lezelupegamapinemikome.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/94528229684.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/pajejuwito.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/25372288023.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/kuzuz.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/limovitawud.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/4871354548.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/8267117984.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/36709614845.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/wetuzugewixadisenopal.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/84863324798.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/vodise.pdfIn PDF document text
    • http://dd-eng.com/files/files/37304707527.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091122443583.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/mokfeh0v4gs16jqp5npm47r83e/87274063422.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/18753755367.pdfIn PDF document text
    • http://halanmilk.com/upload/files/7527831892.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/risabedigesipezoxugo.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/11987749928.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/72104031258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+get+contacts+from+broken+androidPDF 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_off0000f883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF883 17472 bytes
SHA-256: fe00322f0f0fee8199ba3a36680e054aa410aee0ddbfaed9da37bde64f2746e4
font_01_sfnt_off0001261e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E35 11080 bytes
SHA-256: fea61f46dcfb6514b6b379ed11f2e06bbb62d4a6b9131c58857504513c9dbd65