Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56841d47c1219db…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 06:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a3a3f247e11da751ed300d4e9923dbc7 SHA-1: 885dc7c1afb85df9d8f4a0ca4b4c5b89e8732f35 SHA-256: c56841d47c1219db56ea7faf7d55ef685f96192b27a8a97cc7573aa1bcdba9fe
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript suggests an attempt to execute code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://queure.ru/uplcv?utm_term=video+stabilizer+apk PDF link annotation
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/20481510793.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/23492498138.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/xokadagukufafuvud.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/60647059496.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/34338890991.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/68874765551.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/zuxabataxeroza.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133ab3c77551---58567176101.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3d6e633c8---tuwipatofojel.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/kexaxizoxeko.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/zalane.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/96879661551.pdfIn PDF document text
    • http://888chji.com/userfiles/files/nulikezatufudusolubifu.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/xowigivule.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/44954412888.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/dasugutelolavodaguvefe.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/70788330367.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/86953501948.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/5847435215.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/48617234995.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/xukitifavazowapi.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_off0000afd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E7 17900 bytes
SHA-256: e7fd02e478c7d63202ebc19b508a9e25d7239a450dbba76ea4c206c56af0ec58
font_02_sfnt_off0000f5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D6 10544 bytes
SHA-256: 3ffa81ec19948a5ec111b7e8b1df5090f75c416ef4f384a1bfd919035774b5b5

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