Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55ab6ecde07bdc4…

MALICIOUS

PDF

80.0 KB Created: 2021-09-23 04:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cbdc40678115b6f300387875c2d44de4 SHA-1: ac2d121e4d75819544655ffd7bcfa2b5bd734c36 SHA-256: a55ab6ecde07bdc43c52d2417ba6f5c6529f1a09ff36a6d6b716653b93750e9f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

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://garglob.ru/uplcv?utm_term=sa+chess+association PDF link annotation
    • https://sportuna.be/ckfinder/userfiles/files/84263130383.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/91387348302.pdfIn PDF document text
    • http://tecksco.com/upload/files/29086573924.pdfIn PDF document text
    • http://test-immo.com/file/sivejuzegufumiwovumusamo.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/22707056273.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/24120342223.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/jupifiditiberixurixazamog.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/zejivifipapi.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/3571112919.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/49301205734.pdfIn PDF document text
    • https://fong-cai.com/upload/files/bujovolekapizumifuzujuj.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/24692472147.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/revoberi.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/kodesaxefotef.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/13271072843.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/57249841940.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/50878270378.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/muwotemovajakikipox.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/h1ut91vasf7d7bvfd7fvd4t2vi/surawimimuxixiba.pdfIn PDF document text
    • http://mcutech.net/files/77484068134.pdfIn PDF document text
    • http://zzhqhi.com/d/files/94502443279.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/36651427208.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff13253f8e---74079348910.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_off0000d670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD670 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 10256 bytes
SHA-256: e4be177a35f2cd2767c02770e517d66153c5756d9b743081a7c4af2b5f2abb5f
font_02_sfnt_off00010588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10588 17444 bytes
SHA-256: 5864f79c2cc334905fdc047be4e7a49800c848594b8608db97f90cd70a1e7fc6

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