Malicious PDF — malware analysis report

Static analysis result for SHA-256 e10fc1c703505e25…

MALICIOUS

PDF

82.8 KB Created: 2021-09-09 20:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 8ce6b9b09e4b9b4bd31c7d25e2627806 SHA-1: cd4228cd678210d4638d369717513087f9a11f9e SHA-256: e10fc1c703505e2548e2012345c64375c898d7c9e5bbce162efe5cdef8f6d2c5
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=oreo+tv+app+latest+version PDF link annotation
    • https://derechosenred.org/aym_image/files/wolukivubimukudirenetebo.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/purovamovewor.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/kedilumevavi.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/19848837471.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138154f66a25---sutozibabebebak.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/vigewopare.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/pareguxelomu.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/xiguwixemigulepiratugomib.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/37947780401.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/4be28e31d6ceb8789aadfe6b04d5a173/29363078183.pdfIn PDF document text
    • http://origo.ws/userfiles/file/bavazolakemowufofifizewo.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/92509362676.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210908200405.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/82228123691.pdfIn PDF document text
    • http://minipit.com/data/files/rimuxavutasuzibodobebukur.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/79665308483.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/kasusigematol.pdfIn PDF document text
    • http://tourgrodno.by/images/content/file/lonebedevapom.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/37650285845.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/mebatomupugavulomopaluxo.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/66500941293.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/12876694346.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/juzabefijemaga.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_off0000deae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAE 18564 bytes
SHA-256: cb0c81293e8862445847a6c37096c9ccbe67b482d60d553d209e841bd3098877
font_01_sfnt_off00010e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12680 10336 bytes
SHA-256: a9e59d20d855cb2b9ad4d4ea576d225e0d2a897264335beb130da334c5f14b1b

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