Malicious PDF — malware analysis report

Static analysis result for SHA-256 06b4bc3c3ec2564b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 09:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fb984df096c460f757b879bb9bd494f5 SHA-1: e92e18f2dd427fc705df1820d1bde11479e17ac1 SHA-256: 06b4bc3c3ec2564bafa5cfd0ff966c70eb97a4939328db118c0e17844897ed35
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a collection of links on disposable domains, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://infrive.ru/uplcv?utm_term=usb+audio+player+pro+app PDF link annotation
    • http://vin-baietii.ro/ckfinder/userfiles/files/suwos.pdfIn PDF document text
    • http://surestegc.org/documentos/file/70324772660.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb25251b0---jesigidin.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/wukoxewo.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfefbb71b1---xosozariv.pdfIn PDF document text
    • http://kes.org/upload/editor/files/21334608993.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/61334372261.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/97937143851.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/5931109209.pdfIn PDF document text
    • http://brlairport.com/images/file/71548017023.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/43117076269.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-03/fdcbc7be55d91573c62b893aac79f67f.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/58606647174.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/8518780982.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/90101689491.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/28991327515.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/92060049095.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/11944340251.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/33527382469.pdfIn PDF document text
    • http://idcla.net/upload/files/xixituxobaw.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/wojirutebunujuxopoxanug.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/fevozixumidi.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/tajob.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_off0000dde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FC 10544 bytes
SHA-256: 72f4e631fc62fc309d6fbeaa41a49ceb63331f54c72c0cc5f920201e5708c07e
font_02_sfnt_off00010de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE3 16780 bytes
SHA-256: c50731fef3e796226f3ad06f006d33ea953eb7ee79dec9aa7cf747d77e72efe1

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