Malicious PDF — malware analysis report

Static analysis result for SHA-256 c583f8d47c53f207…

MALICIOUS

PDF

74.9 KB Created: 2021-09-25 18:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cbdc8a841362108fe94ad92d2539329b SHA-1: 1f10b1c8da553f68318be39b2eb9194d9a389c75 SHA-256: c583f8d47c53f2077bf1ba3f6b11f6913ef44095608e16f0d6ee3e20f8b55bde
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The embedded JavaScript may be used to further obfuscate the malicious activity or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://laborke.ru/uplcv?utm_term=3ds+roms+for+drastic PDF link annotation
    • http://duz-drustvo.si/uporabnik/file/rutonovejovidebemim.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/67281603630.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16144948c8971d---vililikiwurapovovuran.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/28994650954.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/5000098708.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/jolaronubobotodope.pdfIn PDF document text
    • http://mayjack.com/upload/files/5481480198.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210909110818.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/45025062932.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/guwofak.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/91810019916.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/16201255700.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/6095823224.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/94480040204.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/lejadelubufanomubar.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/51340428259.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369ccc78c41---dewefesagirapenavobumadi.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/kerizepizaratovurakobuju.pdfIn PDF document text
    • https://udruga-invalida.hr/files/1170631541.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/tebixap.pdfIn PDF document text
    • http://konberdbio.com/upload/files/19921753990.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/bebal.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/simovekodufufotaxokajuzon.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/23596532592.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/55060498835.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_off0000be0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE0A 18596 bytes
SHA-256: 55423f6ef18c0bc71f4fdc9f26c56263d5b2d84f2753005b25c2b66e83a27c14
font_01_sfnt_off0000eeb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C8 10428 bytes
SHA-256: a5f43e72bb254a8e0fa3856e3b66851af3d306e0c94ed8c934522aaad0c30487