Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6963ba66e9d017…

MALICIOUS

PDF

70.4 KB Created: 2021-09-17 17:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d81b52a1b5eb9bff2139dc90f5d85a8f SHA-1: 77e568a36772ea4f138ea5b8dbbf0011b474a5a9 SHA-256: da6963ba66e9d017ba2be3bbb90124171270ea22b982a5b20a3074046cb03b5f
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially disposable domains, and is flagged as a link farm. This suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://irinaburmistrova.ru/files/45790824014.pdf In PDF document text
    • http://residencecarlofelice.com/userfiles/files/84479134457.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/42445293200.pdfIn PDF document text
    • https://ysh.my/userfiles/file/muboxasogumowizesana.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/sikiwowojaxatesivafifovo.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/98332714281.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/guvedasuzot.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210905054925.pdfIn PDF document text
    • https://hinaweb.com/upload/file/delemofi.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/13525970773.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/92675757222.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a11d9f395e---nizinewusevezikuno.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109020106214626.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/tetuzapepuzutorepinatidi.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/72465019041.pdfIn PDF document text
    • http://mfahk.com/upload/files/duzilewop.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/35573461743.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/dumipidifunurivasovuk.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/55253776703.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/faefb5cf31a78c05afb134f2513fc28e/darabudasukaxabijod.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/20895709748.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/39308655572.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/92131114497.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/61015397887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=koneman+diagnostico+microbiologico+pdfPDF 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_off0000b420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB420 15040 bytes
SHA-256: f8a181d0a2773d06e03f8cec678f1a8f4407ca73389d0cf343c7629035de86aa
font_01_sfnt_off0000da18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22F 11092 bytes
SHA-256: 308c2e6dfbdcc987cf8d214282f088dccbbfab9b1c1111d2d81a195a4d57c1e2