Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c03c8406d95d058…

MALICIOUS

PDF

72.4 KB Created: 2021-09-08 19:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e91ebb73ab75a90d10bf16f68e4ed655 SHA-1: 4344ee7e0829bb63960b064ca508c1ffe33c16e3 SHA-256: 7c03c8406d95d058141a10a5a2ec5eb8cd7eff57bb547cf1a0d1c8f60884c27e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://smidgel.ru/uplcv?utm_term=cambridge+english+empower+a1+pdf PDF link annotation
    • http://l-max.ru/userfiles/file/39638612929.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/68466360004.pdfIn PDF document text
    • https://digireg.es/upload/fowuwifizezij.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/20321776064.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/55053606997.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/83974512605.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202108311952409441.pdfIn PDF document text
    • https://cooperspick.com/files/76224447130.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138d09f70265---jivoladugomo.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/45178832643.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/neredofalakarutobipakepo.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/73995565056.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-3/20210903021854289519.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/luzevoxixit.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/53807592823.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210905081613_961w20.pdfIn PDF document text
    • http://myshalewell.com/userfiles/file/46578392359.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/goxofugunulekijufubalika.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/61028581555.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/45229393696.pdfIn PDF document text
    • http://3sdent.com/upload/files/judasotazabaxadefu.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_off0000b5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E2 17244 bytes
SHA-256: 3a22d58c24798959418a9e2b75178346d4db3216145e43fdeb9defa2f585c221
font_01_sfnt_off0000e2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CB 11156 bytes
SHA-256: 6ba3b515d001905bf6d646ea660587571b0692c573a26ee17870ada99e02f962
font_02_sfnt_off0000fc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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