Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7512918a46a5dcb…

MALICIOUS

PDF

80.0 KB Created: 2021-09-19 18:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9bc4df127e31d8ce120fd6eb0d751152 SHA-1: 2085be177fd0e245b0e2a045443d7e5fac627fbd SHA-256: b7512918a46a5dcbeaa3b65af127a16bb791267ce4dcc9b6e51417f223ed27b5
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and a heuristic firing for a 'Visual download / call-to-action button lure', suggesting a phishing or social engineering attempt. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the extensive use of external links and the nature of the heuristics point towards a downloader or redirector pattern, likely initiating a malicious workflow upon user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=dead+target+game+apk PDF link annotation
    • http://argyleliquidations.com/userfiles/files/bumugisavixevatakeladus.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/20243460898.pdfIn PDF document text
    • https://gangnampools.com/contents/files/56208522314.pdfIn PDF document text
    • http://intersonik.eu/upload/files/6969886013.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/94136601504.pdfIn PDF document text
    • http://all-premium.com/user_file/files/47938459755.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdddbf1e0b---12101265899.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/xujodomiwi.pdfIn PDF document text
    • http://swhos.com/upload/files/61717012433.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/95884916279.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/38590241478.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/2505534901.pdfIn PDF document text
    • http://benrassam.com/uploads/files/80738540409.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/jixuvapitijalozerud.pdfIn PDF document text
    • http://namngonviet.com/user-/files/53613131575.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/95475070245.pdfIn PDF document text
    • http://eichler-kammerer.de/rizaxexonabef.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/bulekubofixevup.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/vupobuvopijexoku.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/kuwisozivari.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/73519780598.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5e8e38de0---teratipomapilaj.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_off0000d66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE85 10300 bytes
SHA-256: 89a2de68905bf18c6cba24574165933b632066971fe284303f455b0c1e98d483
font_02_sfnt_off00010586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10586 17252 bytes
SHA-256: 6e66424b540823b9db4613b664c86c8fb48196e61041c837e2da073862844e20