Malicious PDF — malware analysis report

Static analysis result for SHA-256 12efb146aea99748…

MALICIOUS

PDF

72.8 KB Created: 2021-09-26 06:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f0ae196e4da47f10e67caeb8f0f8b09d SHA-1: 2c85fc7420711e6e5d6a129b8a44a24a84c70cb1 SHA-256: 12efb146aea99748e7b8dc8932504628cf8edccd27e785473ef9855c7ab8112f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm, suggesting an attempt to lure users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a strategy of using many links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 5

  • 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.
  • 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://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da6b628122---13972077792.pdf In PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/49845931079.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/zimuko.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b12d2d1c1---42575138630.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-12-01-43-44-69.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5066940165.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/57459642378.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109221647358146.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/46780432904.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/16229201946148e54c6fa08.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/4717640886.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/walumolejulovaxawige.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/6023412607.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/sijosopakininelasi.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/jekonarudowagi.pdfIn PDF document text
    • http://reopen911.info/media/file/1100521730.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/zarewudiworowojeli.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/boruw.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/86769827511.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/34501194069.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-25/20210925142838661253.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/kuwokavatagakepukisizap.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/89533965041.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/75408750791.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/51731610580.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/wexonosudolitab.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/kunususedosisote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=tempest+pirate+action+rpg+premium+free+downloadPDF 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_off0000b6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B7 11112 bytes
SHA-256: 1430452b88c88efa9f8ca88c9bf61fa383ef7a593db3996557aa6f4038e7c413
font_01_sfnt_off0000d07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07C 16596 bytes
SHA-256: 14391e2d7b1aed32a80ab14672fc3ca670ca46e708841b8ed7eb00b5588638e8
font_02_sfnt_off0000fad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1