Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c2c52d0b11ac88…

MALICIOUS

PDF

81.2 KB Created: 2021-09-08 21:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b9dbe16a4110f1eb55763126bda1803 SHA-1: 1542a5e0ace93765d584cc4659c59418ef61ae8b SHA-256: 54c2c52d0b11ac88c2e1dfd1a454786ba5ecaa4b5d9b613d980d43e8afd6ac1e
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 are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users through these links. The embedded JavaScript may be used to further obfuscate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://archism.ru/uplcv?utm_term=mechatronics+books+for+beginners+pdf PDF link annotation
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161350267946c8---josazek.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/tezuzefenuperepere.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/zapus.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/menoxuvazaminenekewak.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/jofifojokogisox.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/76683147266.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/12932108748.pdfIn PDF document text
    • https://sona3elkhair.com/userfiles/file/70076989727.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/39768620026.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/tidulerafesasi.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/82033879294.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/57891750512.pdfIn PDF document text
    • https://podimercrm.com/img/files/jamufufomokad.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/dogapelukujuna.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/taburusuvirunuda.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376f52d7b3b---levonabav.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/jujitagevin.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/xirubokudetatenekama.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/75335891282.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/17411045360.pdfIn PDF document text
    • http://myatkinsonfamily.com/userimages/tijamud.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/70837773386.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/9255007138.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///87087142710.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_off0000d80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 17944 bytes
SHA-256: a416ff2c04eba3ce6b26e246b088567c2c27b6eeb47594a988e1d4a2abcad846
font_02_sfnt_off00011dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD8 11076 bytes
SHA-256: 436f218f24ab398358f080b168ea7534a2484e1bed465f5799d8be471565c183

Open this report in the interactive analyzer, or submit your own file for analysis.