Malicious PDF — malware analysis report

Static analysis result for SHA-256 9976f875582fb855…

MALICIOUS

PDF

75.4 KB Created: 2021-09-30 11:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4a62d5a3726ceb711e27212784d0bec9 SHA-1: bc72d290187ceafee7ac6d8490de4cbb0e368321 SHA-256: 9976f875582fb855cb2c3c9bf9813762fd068772547b9ba156c8b870366154c1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript which, combined with heuristics indicating it's a link farm and points to a raw IP address, suggests it's designed to redirect users to a malicious host. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload. The primary IOC is the IP address and associated URL used for hosting the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://langeline.com/ckeditor/upload/files/34570349297.pdf In PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/5872017142.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/72730111529.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/bamazanusukavo.pdfIn PDF document text
    • http://erictex.com/ufiles/files/58018443678.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/tusujilozexikapurupa.pdfPDF link annotation
    • http://musicpark-live.de/userfiles/file/98078672617.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/45186060052.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613251d5ee678---gasigugigixajabagulomol.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/6579257626.pdfIn PDF document text
    • http://i-physiology.ru/upload/fesez.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/45664875267.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/3502194016.pdfIn PDF document text
    • https://kaparatt.com/images/File/82947604412.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/milijaxevuxebaw.pdfIn PDF document text
    • https://festacontinua.it/public/file/kinusosoza.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/40392184223.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/67547026693.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/65666869929.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/58341129958.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/parosezolunakawapuzuk.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/vaxapujanuwigo.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/58697144832.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/motukofomulukazosutuzoxup.pdfIn PDF document text
    • http://jljemc.com/upload/files/45812812325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mejor+widget+del+tiempo+androidPDF 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_off0000bddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDB 18556 bytes
SHA-256: a526c4a800101142278e1bb0c8d7f4553dfed383e0f1e1174e393646fda8c778
font_01_sfnt_off0000edf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 10776 bytes
SHA-256: 75795b54f90e2a1680a30540e54117040d7305245bb42371736c3e808b48e66b
font_02_sfnt_off00010680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10680 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1