Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f578c91bccd155…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 14:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a4d75c466197112d59f1b01212ebfa80 SHA-1: 77c62f5e02ed09c374d6b78c18c39f6dc22e0eb5 SHA-256: c4f578c91bccd1550711cbdd2e52fae117c659d05788193297ca6d94832bc6aa
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged as malicious by an ML classifier and contains a high number of embedded links, many pointing to distinct hosts. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy of using numerous links on disposable hosting, suggesting an attempt to obscure malicious destinations or engage in SEO manipulation for phishing. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a malicious lure.

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://ecodiagnost.com/ckfinder/userfiles/files/xijowulowigepavozuxeta.pdf In PDF document text
    • https://bonekarusa.com/contents/files/duzugu.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/c69f751a692dbd87f25eeb5c73fcacb6/99197187092.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/3073474465.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/60993610218.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/aniposawu.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/19875445589.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/baxizusivovuxasurogurukuw.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/54502718449.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/56580504980.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/91478592373.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/95610525425.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/27755033193.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/95590988737.pdfIn PDF document text
    • https://terracell.info/images/file/97570238578.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/kavutalenulax.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/72051874286.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/tajomezirufubuzonadi.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/nurizalajuxaxinejun.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/32424535796.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/41199048390.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/71941711228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=talkatone+android+appPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/nejasorutikunedawowijulag.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_off0000dc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4E 10272 bytes
SHA-256: 270d25d4939e40e9c9f4783d8700b2f36200591817e27608299431078eaccb7b
font_01_sfnt_off0000f37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B90 17792 bytes
SHA-256: e8ac4395486bf0c3a96e7a286bdb407bf13edb14205b97ed144017fe9f53b07c

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