Malicious PDF — malware analysis report

Static analysis result for SHA-256 603d31be904d9f67…

MALICIOUS

PDF

72.2 KB Created: 2021-09-28 06:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0635cb3adeea6d36f6a819bda1c8fa8d SHA-1: 075dadbf9b7243cacdca78828294ec57e446e726 SHA-256: 603d31be904d9f67adcba72d548ffe746807faf4a2e32508fa4618515fb1e2d2
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 hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further compromise. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://mundori.com/js/ckfinder/userfiles/files/3781449499.pdf In PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/33096834930.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/46503918694.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/1570528563.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/60142563229.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/62389365266.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/keritekabuvudelija.pdfIn PDF document text
    • https://arbormaster.us/uploads/files/65906185210.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/61007650673.pdfIn PDF document text
    • http://westfield.qa/multimedia/userfiles/file/bipojukefobivusipexozup.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/56504553914.pdfIn PDF document text
    • http://emeat.ru/var/files/wonarajeg.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/kusekewotes.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/78241399536.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/kapol.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/jekujuvadisixom.pdfIn PDF document text
    • http://health-bridge.in/upload/file/44257783908.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/27fd548b3744595758e61082ad6c9136/gitakaj.pdfIn PDF document text
    • http://lblussana.it/images/file/78864407085.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/50823422041.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/wodumumemowederufajofumor.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/bexadopizedeb.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/64397264350.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/59148080225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=snappy+streamz+live+tvPDF 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_off0000b459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB459 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC70 10608 bytes
SHA-256: 208ef6416d1d6f2fd5a403117960ee90c1f7968633ed4f936569e2efdd733670
font_02_sfnt_off0000e4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BA 17916 bytes
SHA-256: 2218063eaecf91e73b1921434b56bc32c24d47dd9f3b4ab381578f2396b95304

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