Malicious PDF — malware analysis report

Static analysis result for SHA-256 55dbad8e0b9ea2eb…

MALICIOUS

PDF

85.3 KB Created: 2021-09-16 13:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5bc9e4074ca86f7f7192af5ebccea49d SHA-1: 51b34560bd236297f95d128f9690cb1a552f70e9 SHA-256: 55dbad8e0b9ea2eb57c3fed0b8cf342df22d832bb523e0452b90e369c0c0fdba
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to exploit vulnerabilities or deliver further malware. The embedded JavaScript is likely responsible for initiating the redirection or exploit process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/19012993687.pdf In PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/56652999392.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/88301095816.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/69030227682.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202197204629128.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/30091232378.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/juranovujenata.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/31212703079.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/35667763921.pdfIn PDF document text
    • https://uudanbury.life/files/file/61164442086.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/25127490065.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/20889505020.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/puzokuv.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/minogirasiwuvuxavolev.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613459edaa789---53431304246.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/disonorotudaxufubuvebum.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613488af8c138---nineburimisesixajolo.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/43235901207.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/jimofa.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/selatunoronewub.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/jelitifawovokawu.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/ladasutugi.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/96588325387.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=best+contacts+and+dialer+app+for+androidPDF 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_off0000e75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF70 18056 bytes
SHA-256: 6c72b8a5ebf078f84dc78c1378aa78162a4fa6d3246d5dbde1d7b59c1841df8f
font_02_sfnt_off00012e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5A 10668 bytes
SHA-256: ad0c93a60667e146f8147cb6852f8890c46cc414b13e5b3a3063dba02692c1bf