Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8242cef660489e1…

MALICIOUS

PDF

80.8 KB Created: 2021-10-05 16:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1b7d8e2439e8d95e3da45730f037dc40 SHA-1: 5251dc50ad05762647ad25cea36b23f49983a72a SHA-256: b8242cef660489e147d29a85adaf0f5093e05dea6e8a3dd39f7a57b738167081
66 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, suggesting the document's primary purpose is to facilitate malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://allytemp.ru/uplcv?utm_term=how+to+insert+gif+in+powerpoint+presentation PDF link annotation
    • https://thehideawayresortpattaya.com/userfiles/files/78122517493.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/biserenizusujenu.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/28440468611.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210909_A2C09C01EC5F6C96.pdfIn PDF document text
    • http://getem.pl/files/file/64070218883.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/8188308953.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/zibejepowasesosafapa.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/89948236800.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/59036723430.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/53783119949.pdfIn PDF document text
    • http://unsersohn.com/images/file/95081760180.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/voxatul.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/jegubudesebiserozapejaw.pdfIn PDF document text
    • http://www.siposferenc.hu/html/80445405641.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/72659690435.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/6886988659.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b75052b28d---23398755700.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/60253970181.pdfIn PDF document text
    • http://chieucoingason.vn/files/29521930502.pdfIn PDF document text
    • http://ktcz.eu/files/files/pilegexedosiwetuxeju.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16138e09bbff4c---bodapadefedirigoto.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_off0000d3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EE 18296 bytes
SHA-256: 8bee5cb8bcc7aa57a7e88d97563cc210d7880052f26da54990bea62ba71ab4bb
font_01_sfnt_off00010400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10400 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C17 10564 bytes
SHA-256: 4ee7b96af12817f081337c38580864d9908a24267ff7f65d92f4af7f66e00e32

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