Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ab68f8d580cfa1…

MALICIOUS

PDF

77.5 KB Created: 2021-09-09 17:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 146176581009e9bbcb313dcaceb93c05 SHA-1: 7fddc37d7600b24ae2d262cc945d10960b47a583 SHA-256: 11ab68f8d580cfa1420355af563788f87091f7c2ae6a3983a713aa48eaafde4f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.dgtrans.co.th/login/ckfinder/userfiles/files/89415543226.pdf In PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/5664f39d724f5cb287118d9f8d1c5b96/46557369592.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/7cc7167e13d87e2746338aa88863c5e1/xejotuwegoteg.pdfIn PDF document text
    • https://digireg.nz/upload/23058713797.pdfIn PDF document text
    • http://stevis.cz/files/file/14463814784.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/33399124939.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/gividuwajit.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/010728483385.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/60936344198.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/tedumupa.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613227194f967---53484308354.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/82577929965.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/86787479957.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/8074970448.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/99617485800.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/88743368481.pdfIn PDF document text
    • http://lovesenergy.com/file/92613877319.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/nonutilevutipagi.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/pifabilolusibodujo.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/fogapiwafiguzo.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/56480294210.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/93782894908.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=pdf+annotation+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_off0000cdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB9 17172 bytes
SHA-256: ad48bba408504da5429de06622eddb6189745d19195e3ef51ccb4b736259cbb3
font_01_sfnt_off0000fa44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001125b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125B 10000 bytes
SHA-256: c2172b2c0b9cf07e71fd0fe22a1b4009f40f105ae6efdd32a91935fe65000231

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