Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8e127cd4f92c28…

MALICIOUS

PDF

84.7 KB Created: 2021-09-17 10:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1b60db03dd5421c1a4e2be627a7ee601 SHA-1: 0c2903ae290c084a2952cf38e48bff7504c73b1a SHA-256: cc8e127cd4f92c282a2e7c52fcad3801c566f23a9e297c2b69b56155a6145e3b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The heuristics suggest the document acts as a link farm, directing users to potentially malicious PDF files hosted on various domains, likely to facilitate a phishing or malware download attack. The presence of embedded JavaScript further supports the execution of malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ea8f39723---20442705905.pdf In PDF document text
    • http://asu78.ru/userfiles/file/numuparukizojutujezaduxe.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/fudamapivexoxamitelaji.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/15106083498.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/69574092381.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/walali.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/38222049971.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/38567210420.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/11944512160.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/mulorolunojeguk.pdfIn PDF document text
    • http://hk-keber.de/images/file/podabulalunozelo.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/juvus.pdfIn PDF document text
    • https://vpmemorial.net/images/file/faluzexitofesapele.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/xabewusem.pdfIn PDF document text
    • http://knipia.com/userfiles/file/24453549774.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ded11c0d0f---30297373552.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/84201261614.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/73424223088.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/94897407132.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/mowedegurowi.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/21062098810.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/xuxodef.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/82357857442.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/60369689197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=download+smart+tv+appPDF 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_off0000e845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001005c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005C 10480 bytes
SHA-256: 1c9eacb58f1f4171a2fda6990ababf9f87794ff9391b4716127d815f16532b8e
font_02_sfnt_off00011830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11830 17720 bytes
SHA-256: d411318b0eb3359674451f5c67bd1930fc1f3e1e22dccef78e61c857c6c82967