Malicious PDF — malware analysis report

Static analysis result for SHA-256 b48cd9982f68d032…

MALICIOUS

PDF

76.6 KB Created: 2021-09-09 04:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5190ef50a66790b1b9de6eed265c155a SHA-1: e8c19026c0e83bd33310a0e1ee70be5e07d8c21f SHA-256: b48cd9982f68d03227cb3c308a4661ae6c850657a2f23d5e484ce2d7a59565bb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous unknown URLs suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://www.stsmcc.org/www/js/ckfinder/userfiles/files/79605576777.pdf In PDF document text
    • http://prplus4u.com/ckupload/files/wevelafuxoxibirof.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/89298100869.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/52656894873.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/31603609742.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/87534379919.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/58845584202.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/dakinakisavoxada.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/rizumezokobidifonotaxap.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/vibiwenedek.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/co2rgmukoarjs64k60fa7f7f44/50908860060.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f71ffb86a4---29429525705.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/69795064613.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/12427589721.pdfIn PDF document text
    • http://yingtailong.com/upload/file/2109040810429652746lv5nj3oail7.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/2805311146.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/43345157546.pdfIn PDF document text
    • http://falconltd.pl/cache/file/saselodiraki.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/jujitagevin.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/vavovakeduwajuvizopexivuz.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/meditemukimula.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/pumelafelozum.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/gapajumedejuwewigados.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/lobukatutojakibuzopubalo.pdfIn PDF document text
    • http://marketingnews.fr/images/file/gilizanusujow.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/xonelobupejol.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/bajawokukuwageginapiru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=download+paper+of+awakening+minecraftPDF 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_off0000c4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AB 17744 bytes
SHA-256: ae0713441d07f9d25f736758121e20eb108697fd6a1b9affba17cad55a9be6b9
font_01_sfnt_off0000f348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF348 10972 bytes
SHA-256: 40c7dbb1f3d2224b668c3c295620f9de39c7d89fe8b3d73acb4b4685b2fc36da
font_02_sfnt_off00010c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1