Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a37dc977d6079c…

MALICIOUS

PDF

102.9 KB Created: 2021-09-19 04:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e2e94bd6edc51161b05d38b5a053d61f SHA-1: 804da9cf5482b3bceb36a7d645d5ee4de69f7df9 SHA-256: c0a37dc977d6079ccbb0402dcbe7d2a8326f9ee9b9f75fdf3bc364dcdeadae2b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://crewmak.ru/uplcv?utm_term=fifty+shades+of+grey+1st+part+full+movie+download PDF link annotation
    • http://4seasonstours.in/userfiles/file/9453530215.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/xelabumurinitoxosixexubix.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/notalatajutipowuxata.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140e9d749329---25248927783.pdfIn PDF document text
    • http://espwireless.net/uploads/file/zokitexudexuxofirenefu.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/fufas.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/32597361138.pdfIn PDF document text
    • https://medtek.vn/storage/file/84469120947.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/58405375463.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/tolivevukopozijigu.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/80241036426.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/20819811898.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/lededuxilejagelegozas.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210906074906443.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/nujodadekiralafubijib.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/tanabewe.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/lamibabep.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/monogitifajuzodobatizib.pdfIn PDF document text
    • http://classoft.ro/userfiles/file/wagubug.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/75478374238.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/bogixanibakowefuwosedus.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/72934886164.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_off000128eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EB 11340 bytes
SHA-256: 3ffa07c621a643f218c8d2b06284e0e32130225f3e462a7b9c9c39502b661d9d
font_01_sfnt_off0001434c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1434C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B5E 19452 bytes
SHA-256: b5b968605835a1874da0d19a162dd6e8a9612e9e757cc216e91394fd648d620f

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