Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7e5df39cc04c73…

MALICIOUS

PDF

69.3 KB Created: 2021-10-01 11:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8d15064d629c462abcd2480f7ac75fff SHA-1: c948ecedbea2a8dc067f90a0bb8adcf74f283598 SHA-256: 6c7e5df39cc04c73164e7fa86b2b048b058994f94795d3d7db491967ff97a642
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://trade.inter-ural.ru/ckfinder/userfiles/files/1347235304.pdf In PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/jixuxisugi.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202191184665367.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/39178031031.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/kiposutozivu.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/nuzerojuzud.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/241be42461e5ccbb38dac0f9950985fa/sevozosugejexel.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/sopejisiwasoduri.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/zegenila.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/vedelexubonub.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/zereboxiretivixijufabota.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/94649208387.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/segofozoxetulikot.pdfIn PDF document text
    • http://rsst77.ru/upload/files/lewivodotuvasuxenulaz.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/5182878483.pdfIn PDF document text
    • http://seashinechina.com/admin/fckeditor_upfiles/file/2021092300151780554.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/masinabonajepowam.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210917061635.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/27228275182.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/29846417581.pdfIn PDF document text
    • https://kaparatt.com/images/File/18513037014.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/xepexunoge.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/pezitozavuforu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pattern+lock+designPDF 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_off0000af18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF18 16092 bytes
SHA-256: 7a84244d2c3fe073905bcd4f4b9c4c4367ac7aa8ac56450414eb5a358bd6d8de
font_01_sfnt_off0000d795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAC 10640 bytes
SHA-256: 8a3e6e69c286b864992400adbd3238617ccf98911c0b36c24802cf9018684b9d

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