Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c11e7bcb928370…

MALICIOUS

PDF

69.8 KB Created: 2021-10-04 11:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1e5a5b6a4fbd56ecf225ce99d3267701 SHA-1: 0fa6d134ea4c382b4adddd243a35e2fe7a83a048 SHA-256: 12c11e7bcb928370986100eb87de7ba74187113e43a0c79237324c7c75b22677
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external links, many hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The embedded JavaScript likely facilitates the redirection to malicious URLs, contributing to the overall phishing attack pattern.

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://coretry.ru/uplcv?utm_term=diagram+of+digestive+system+for+class+5 PDF link annotation
    • http://cravaluos.com/ckfinder/userfiles/files/wiwolowosadaw.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/vedogofolugokobinafe.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/dipawirero.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/rudotofegolomuzut.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/rijidixitebavozenijofijig.pdfIn PDF document text
    • http://zzquansu.cn/d/files/34428343560.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/18411399537.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/xagobufiwipodobub.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/30046554804.pdfIn PDF document text
    • http://tion.hu/upload/file/jokixipufafurudejaxunadaw.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/jajonaxokoja.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/budinakitileberup.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/gawukefo.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/15508796325.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150f27b5732f---30635835498.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/kesovutine.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/30524859093.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/64632238989.pdfIn PDF document text
    • http://pskov.agisinfo.ru/uploads/content/files/81131730303.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/15265027405.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/sosizizew.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_off0000ad41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD41 11028 bytes
SHA-256: 413cc7e55e620d513464851028c0214454d22352f93271f0e2d7883c55362e99
font_01_sfnt_off0000c6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D1 16952 bytes
SHA-256: 152687ce8e2e6824257fbcea3c0de143ff31e19eb8f31bc2d3e999cf2139c6aa
font_02_sfnt_off0000f19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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