Malicious PDF — malware analysis report

Static analysis result for SHA-256 2384f293beceb834…

MALICIOUS

PDF

77.3 KB Created: 2021-09-08 23:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: feb46748fa30d3ecceac57d01da385f0 SHA-1: b5e004593c940c075ebb4ed152c9f11bf6ea9103 SHA-256: 2384f293beceb834cff069700b86ca7141b211fd55dcfbd4c6725f829785cd4a
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. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous external URIs, many pointing to potentially disposable domains, suggest a link farm or phishing infrastructure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://thebeautyofdesign.nl/ckfinder/userfiles/files/vapusikajelape.pdf In PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/vumejezuxuxexufez.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/lojoseliriwukabokagagex.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/60088091885.pdfIn PDF document text
    • http://turnyras.lt/Files/file/67854197699.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/66083761161.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/90690352735.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/watuvan.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/18705390994.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/23326516184.pdfIn PDF document text
    • http://centromp.it/userfiles/files/wokufiwaxegodivanadosuru.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612fde5652c7d---8491839932.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/78410143979.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/89918784145.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/24394128393.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/zonoxalutoxukeb.pdfIn PDF document text
    • https://anandalaya.in/resources/file/duxaj.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/78804395428.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/76411063038.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/zelililem.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361c9b34691---bedowefob.pdfIn PDF document text
    • https://mcsfood.com/images/file/dojekiwovod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=makalah+tentang+android+pdfPDF 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_off0000ca6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6C 17632 bytes
SHA-256: 7d8f74a41b8d831f81c61eb223b09a7908200d801c1d9ebadaa9e2cbf79ae585
font_01_sfnt_off0000f7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC7 10692 bytes
SHA-256: 218485dd454b96c2364fd2d954c9664bdb2ce77aaf58b669c4ecafc8c0a5fcbc

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