Malicious PDF — malware analysis report

Static analysis result for SHA-256 326fb09d0f6c8e58…

MALICIOUS

PDF

77.5 KB Created: 2021-09-12 07:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 52281ec45e3663747a8a21b548e8164a SHA-1: 9e4a699e5335e7b1b919909bc8e315d2f96a093a SHA-256: 326fb09d0f6c8e58e9320056ab15b83366fda883b84d5ca14ae0ccd49b3e72d4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for executing malicious actions or redirecting the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://elitakhealing.com/ckfinder/userfiles/files/dasodumezeleted.pdf In PDF document text
    • https://mamotato.ro/userfiles/file/lemubimufepakuputuwejowut.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/dowog.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/161323f1f7e8a2---mitalelanafava.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/nujexirizurumefo.pdfIn PDF document text
    • http://dentherapia.hu/files/file/21000471710.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/tolusesumipubumawowom.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/vaxomamejefomufexomekemew.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/51239380454.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/26232068855.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/widasaduvapojowimukeral.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/95909027499.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/77829410420.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/40031192001.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/93481188227.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/pitisilewalavifatejilis.pdfIn PDF document text
    • https://petek.biz/resimler/files/kapiwegurinenujobaja.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/26353934876.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/zobagi.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/26175469658.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/dejejupejejotavapeniw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=best+free+gba+emulatorPDF 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_off0000cdbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBB 16648 bytes
SHA-256: 7d180f444b930a5b9024a38ba0a930034e1be7844cdf5ad061460475ac1e5c0e
font_01_sfnt_off0000f87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11094 10652 bytes
SHA-256: ab225a2e09a242a6208222cb49996c21e66c47fd707c20258254664adf739fb0

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