Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d18db25742c5d6a…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 06:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d8a7a790fbcb889446bd61830022fd28 SHA-1: 905870e7e51909bf0a0a3e68c30c7267f80f6a4e SHA-256: 9d18db25742c5d6ac684a57b9742d1f85ca2868880c5e1c8934c19bdce3f9ddc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution scheme. The PDF's structure and the presence of external URIs strongly indicate it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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.
  • 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://medvor.ru/uplcv?utm_term=crazy+stupid+love+watch+online+with+english+subtitles PDF link annotation
    • http://dansungsala.com/uploads/files/nogajutad.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/99341149264.pdfIn PDF document text
    • http://01host.ru/userfiles/files/fesedumonuwog.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff88c7bb2d---lukoribuzukesonerulid.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/22049138679.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/78113440701.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/kiwinadutetaluvopinaj.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414e6d838e4---40721754166.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/favojakabaviw.pdfIn PDF document text
    • http://mp-journal.com/media/file/relesav.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/613a83f54d286.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/vefejipixun.pdfIn PDF document text
    • https://themalc.org/files/file/32770333886.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/duzem.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/86149838868.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/59993510141.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/narikaruzuku.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/87163746748.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/vawirodozoxoledilebis.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/90976180730.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/48813935080.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/52636030374.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/xuregabigijof.pdfIn PDF document text
    • http://surausa.com/uploads/files/7255262422.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/49651751802.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_off0000d36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36F 11388 bytes
SHA-256: 07b2049583669bb0ccf5ca64052fa51ed2b749df14ada4a0a493c9268dc3632b
font_01_sfnt_off0000edf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF0 17328 bytes
SHA-256: 38f2806c835ef428c0db79b95378bfadb9000cf16521a305dd7d2270c689e162
font_02_sfnt_off00011b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1