Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f885b44b592c2fe…

MALICIOUS

PDF

80.3 KB Created: 2021-09-12 18:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8a8dd540c639a45bf5ed55d9ee3a1a46 SHA-1: dfcefa45c96712ccbc5cec02f991902fb056071a SHA-256: 8f885b44b592c2fe02184b878b60e1d877202ee099a0f2e1d6f41a3fd49c64ea
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by 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 0.9977

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://pixomot.ru/uplcv?utm_term=quickedit+text+editor PDF link annotation
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/puzof.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/q8pdatfre4ut55tehboc0lqng7/84803663808.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/43941204299.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16130aa7c5459e---zanulewosalipetebufuzir.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210903064332.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/62375244879.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/33083237482.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/84376103412.pdfIn PDF document text
    • http://business-baltic.com/myfiles/dok/9697162506.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/9133780492.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///sokananiw.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1418018747613d7e3b54a74.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/jaziwezu.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/57062569030.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/bemuvojojasekil.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/71572163442.pdfIn PDF document text
    • http://santeh.md/img/files/58632832170.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/fababajawuxupexuxojezokex.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/80213933225.pdfIn PDF document text
    • https://tckontrola.hr/files/3160933465.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/liper.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/rasesuvefexi.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/wesijijukejezitigizaxi.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_off0000d86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86D 10236 bytes
SHA-256: 5a0743a2a5a138c18c5c6be614f4b84f316c3681ef2591288f3a7a284c346803
font_01_sfnt_off0000efa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BA 16784 bytes
SHA-256: 9bda9ab00238a1912011649b0e0bca65a2eef6ad670d10bf3cb8f51cbe95b65d

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