Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9655b240c2fdc77…

MALICIOUS

PDF

86.5 KB Created: 2021-09-16 09:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c4a213f7fe8d40f35e7be69574cd9372 SHA-1: 974f1396a47433e8b7e9557db95566625d56ccee SHA-256: d9655b240c2fdc77aa858e27528f6bb1d6dc4866a1852528d4405f480daead8a
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a likely SEO poisoning or phishing campaign. The ML classifier also flagged the PDF as malicious with high confidence. While no scripts were directly extracted, the nature of the embedded links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 4

  • 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://huntic.ru/uplcv?utm_term=prayer+of+the+faithful+2020+pdf PDF link annotation
    • https://khambenhxahoi115.com/images/files/fugawunarozime.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/dutorusumapipasuzurutesil.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/47067394345.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/peravunasubujiwujofuji.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/lerunuzujubozosifututom.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/38287243358.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/5867807446.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109012309066923.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/81124848738.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/wezegigozodusabigatoguv.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/93296255684.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/94759603555.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/zexevetononoxitu.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109051250364928.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/97601939867.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109052148223245.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/tebixap.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210905_3C2D8363074BB511.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/0r4s083l1j40nk27n7lkb6d287/tojobizutonidun.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/batopetiji.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/negujojuvisebozigokofapo.pdfIn PDF document text
    • http://dmkert.hu/files/file/befupu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81F 17064 bytes
SHA-256: c3cd76ee27dc5b32b99bccf2e031ba0b0ea289e1abf3dc302438285c0aaff871
font_01_sfnt_off000103dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DC 10780 bytes
SHA-256: 7355b476b8905c8f348736ca2d3af3aec8c3a2ca3255aab0db848fd6221bcd8c
font_02_sfnt_off00011cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000134e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E3 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878

Open this report in the interactive analyzer, or submit your own file for analysis.