Malicious PDF — malware analysis report

Static analysis result for SHA-256 4242c6980934b804…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 03:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a6fce04c97e47e956e184054dbe8e953 SHA-1: 4af48b78aa24c4e4dc749f829f79582fdc2fae28 SHA-256: 4242c6980934b804c749861ed51ce02bd12ae05f0996dd4b60e8421cecd653d3
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high density of links on disposable hosting. The ML classifier also flagged the PDF as malicious with a high probability. While no scripts were explicitly extracted, the nature of the embedded links suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=my+hero+a+academia+season+5 PDF link annotation
    • http://0048.pl/48files/file/foxapikan.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210904041524.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/nuride.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/nezorutepipefixeluv.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/69521864468.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/detivalunafoloruz.pdfIn PDF document text
    • http://vecsecity.info/editor_up/26436597907.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/c41be8621a1ba092a3d4fd9d9295cff3/11344087766.pdfIn PDF document text
    • http://kdekdyjak.cz/data/21385016963.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/84285203784.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/47323851841.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/metifosunu.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/rozoka.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/52781316460.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/97836974787.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/vebalaju.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/9119486616.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2607e0a4d---32094278295.pdfIn PDF document text
    • https://chsromania.managenet.ro/images/file/99183216595.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/53981232085.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/ginoxarude.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/zefakawebiguxalebaleg.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/21898968937.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/fesileluki.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_off0000b0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B7 10732 bytes
SHA-256: d912d0a55ac20e88d5d3665e00a75533d2ef132ecbd5f281c81999a19c6cae3f
font_01_sfnt_off0000c93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93D 17044 bytes
SHA-256: f3f553040620fb4014c00c67efec3a4b21e8d3c6b2942f089f0088b13ee15f29
font_02_sfnt_off0000f44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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