Malicious PDF — malware analysis report

Static analysis result for SHA-256 9494f9e6d6e75c7e…

MALICIOUS

PDF

72.7 KB Created: 2021-09-19 03:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: b0a557ea1111d8a790c69826bf88bc36 SHA-1: 407306aad6d0a65a386bd1e2163e355086707532 SHA-256: 9494f9e6d6e75c7ee8271e3dec61d57876d9ef88d16dd2788710bc79e0bd74e1
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by multiple heuristics, including ML classification and ClamAV. It contains an embedded JavaScript stream and numerous external URIs, many of which point to potentially malicious or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of JavaScript indicates an attempt to execute code, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/mizomemilukekur.pdf In PDF document text
    • http://wang023spa.com/userfiles/202109file/2021090109480870554.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ve8qi1sk3qpc4lh4kj28v2bjg9/15183350498.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46339018723.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/pesorop.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/ponumasevepi.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/43659343417.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/25741106719.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/wapeteb.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/85760750733.pdfIn PDF document text
    • http://wenxuezj.com/images/File/8125372712.pdfIn PDF document text
    • http://oodow.cn/upload/file/210919065730222809uyhovxo1nw4l.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6aa63ec88---wobobavidovibimegoxoge.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/mefetu.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/78776648533.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/75155916.pdfIn PDF document text
    • https://camphacement.vn/upload/files/tewedaz.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/98679308836.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/debosaxotuwepazanidubu.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/meremuv.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/66654958004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=pubg+update+1.0+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_off0000b6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C7 10776 bytes
SHA-256: 2e758f495cbef61710561292517ba1806f27034ee3ffec7e758e3d657b1f1de0
font_01_sfnt_off0000cf5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE771 17700 bytes
SHA-256: 06524404e825ecf67a6fac7e168bcf0145a86152463aea713d1280cce5d8d667