Malicious PDF — malware analysis report

Static analysis result for SHA-256 4915b13d53156f06…

MALICIOUS

PDF

75.5 KB Created: 2021-09-17 11:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8e77654a543cc97bc38ffc9ddf45e704 SHA-1: d60285cc7e78d5ce981d881c799f8b812f8e64f2 SHA-256: 4915b13d53156f065bfada2c6d57a04e6891e50ad8bec27e9a983f8e5771d2f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample was flagged by a machine learning classifier and ClamAV as malicious, with high confidence. It contains numerous embedded URLs, many pointing to suspicious domains, and a heuristic identified it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://msnladyboy.com/ckfinder/userfiles/files/21191660720.pdf In PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/lipadomef.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/dugopomotodab.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/55058058136.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/mirujizeguzokozokeba.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/tupuzoxuf.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/99863948638.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/raxewusikafipinak.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cbea0ea03---49699638530.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/97448795333.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/2629874594.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/temavobi.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/pegivezoviled.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/mafudutikovaliwowovo.pdfIn PDF document text
    • http://soc-in.com/data/media/files/19549316002.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/60459795682.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/megipiditaxiledob.pdfIn PDF document text
    • http://labonscafe.com/userfiles/vipowukuboletiduzopob.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/mufawapesovekunozalure.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/raradejazaraj.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/80189851365.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/gisijukizakupunowebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=boruto+ep+52+bg+subPDF link annotation
    • 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_off0000bb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB68 20100 bytes
SHA-256: 282273ef611c89706cf9fc5576919139598c05500fbe71ef006bf7be55b7ad8c
font_01_sfnt_off0000f03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10851 10572 bytes
SHA-256: 3c54db1bcd6b88ba166e51ce5c6a670e15ffd5701c4e4a52dd58409be475284a

Open this report in the interactive analyzer, or submit your own file for analysis.