Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4636b69d9e9fbd8…

MALICIOUS

PDF

91.4 KB Created: 2021-09-08 14:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aeea6ee0e5734f64d5d4aa5ad2f7e36b SHA-1: d3219ae17e22f7c81edc3da6e598eae9937e461f SHA-256: f4636b69d9e9fbd8aa25a8235f213ebb1e81927b819454e6fe3e55a35d4225b0
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a high number of embedded URLs, many of which point to disposable domains or link farms, indicating a likely phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, but the sheer volume of suspicious links suggests a tactic to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://huntic.ru/uplcv?utm_term=way+maker+chords+e+pdf PDF link annotation
    • https://topconta.ro/userfiles/file/panatuwazubopen.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/kipiwutisolug.pdfIn PDF document text
    • https://forssh.com/userfiles/file/28382605172.pdfIn PDF document text
    • http://htwy.com/upload/file/kiromatu.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/18531701047.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/22997746541.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/fazitupizebezovomilokizir.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/wagofumazuv.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/fodamigejofu.pdfIn PDF document text
    • https://actorconseil.com/files/file/27708617889.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613485f0826a6---98999706420.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/26189245781.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/volodaromu.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a18ab04e0---pelomokimaxukatojimirof.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/womufebunugob.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/bozumatebakoxe.pdfIn PDF document text
    • http://klenderbio.com/upload/files/88305468755.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/93693548385.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/73389040792.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/22738276697.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/seguretilajafabedas.pdfIn PDF document text
    • https://taperagi.com/contents/files/66097806931.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/18979416964.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613470409fff9---43066848651.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/4662997855.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/ruxomela.pdfIn PDF document text
    • http://www.moyekolodin.com/files/bewikuwiruxevaz.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_off0000f6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDE 21720 bytes
SHA-256: 611b8301b0ca9bef5f52858422e91e8d278e05d22fffa0166bc85c7423753241
font_02_sfnt_off00014763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14763 10744 bytes
SHA-256: a5a8d951d9ad406c78b7138e11034040cb37741ab5fe3acfbfc5b75fde482b5d