Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c430fcbf5e408a…

MALICIOUS

PDF

67.9 KB Created: 2021-09-29 12:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ef05affde36185337b89d0e3679c1859 SHA-1: 64c0193dc5a46ac3b94cf44d756999c76c64f842 SHA-256: f2c430fcbf5e408a16c38420c53acc6c60c9c33523f508e07274938afa365a3c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing an embedded JavaScript stream, which is a common technique for executing malicious code. The PDF also hosts a large number of external URIs, many of which appear to be part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://pistant.ru/uplcv?utm_term=is+redmi+note+9+a+gaming+phone PDF link annotation
    • https://eqonetech.com/upload/userfiles/files/nomatavinakavowokokuwol.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/difojazuna.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/41320892219.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/sujabitagosuziguf.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/58079141265.pdfIn PDF document text
    • http://viorina-deko.com/images/file/sugabi.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/magosob.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/dojawuzivepetaj.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/rujifavow.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/lomiroturanegojati.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/vifidojanekapudolik.pdfIn PDF document text
    • http://telecycling.org/files/file/vevegexeva.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/tafodizexuk.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/48769630592.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091122035357.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/relela.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/rifuwetavuvalip.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/kipeterewide.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b707db5ae3---lesinixojobiwumizufivuvaj.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/wisijukobuganopuvete.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153917a3ab97---jeforupulawuxog.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/netenanunonipidoxubuz.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/87586027828.pdfIn PDF document text
    • 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_off0000adea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADEA 10912 bytes
SHA-256: 5bc452505e77ec3a40dda74ad45e65cd88f4f25a1605a25c95f20e697c68fc21
font_01_sfnt_off0000c6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C6 14376 bytes
SHA-256: 44083bea67d13c2747a1fa922e51c682312f5f0edffb54e86db65c09abb00c22
font_02_sfnt_off0000ea60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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