Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a5db70716824c6…

MALICIOUS

PDF

75.9 KB Created: 2021-09-13 15:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6df9171b07fc83c40e6c9a5abe535f62 SHA-1: 05369d536dd8347b6153bcda8ed919f0d80b19f2 SHA-256: c5a5db70716824c68252a0a3b8197a36c5461ac85f3113cb2cd1de916a554e30
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a high number of external URIs, many pointing to disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.padanguparduotuve.lt/ckfinder/userfiles/files/90239382351.pdf In PDF document text
    • http://rvhifi.cz/files/file/74037011585.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/makisuki.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/repevi.pdfIn PDF document text
    • https://megashina24.ru/files/files/mijuzixedozexetevunojo.pdfIn PDF document text
    • https://conrays.ru/f/data/59541652518.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/xusipuluwaxorivisas.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/59387056053.pdfIn PDF document text
    • http://sms-dk.com/FileData/ckfinder/files/20210905_6CD225FD417789DE.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/28774487987.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/soxoris.pdfIn PDF document text
    • http://clingac.es/d/files/padekipobanesavujebop.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210912075651.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/46967317453.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/puvumad.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/59031614356.pdfIn PDF document text
    • http://workontext.ru/media/file/gunakofuxexetazu.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/zulikalunominojeliwufima.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/84815959922.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/pojibetewisovokutam.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/xuvopib.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/47667078447.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/58096356385.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/balemipe.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/59244259879.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/99bd648beac616e7f37b463613d739d6/vavapozaxetutaserifabew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=dragon+ball+super+episode+32PDF 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_off0000c38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9C 17312 bytes
SHA-256: 2215ce8ae414401def725de46e6fa0eac643cde1868391df211e22cb718f2ab8
font_02_sfnt_off00010877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10877 11004 bytes
SHA-256: e42b06db34dcb02d93dea7a7a192788b2cb8a0bfaef1fd4e518b5ae61c4aa9e9