Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa99ced6d0712ea3…

MALICIOUS

PDF

68.1 KB Created: 2021-09-26 12:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f993185a0dd620fa696d9cdc2d5a094f SHA-1: b954030230b8b5e03fae35b536ed84acacdbf91d SHA-256: aa99ced6d0712ea3dad6104b500d2581857d0e0a3a2394be9aad6171a7a18f98
66 Risk Score

Malware Insights

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

The PDF document was flagged by an ML classifier as malicious. It contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates that the PDF is designed to host multiple links on disposable domains, a common tactic for phishing or distributing further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce785ed89e---761209761.pdf In PDF document text
    • http://argol-editions.fr/userfiles/file/zafibesidixokugafiw.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e049246c55---tafiboxub.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/taferenuxaxes.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/26106927408.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/bonejirajipivugodavinag.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/6592775095.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/gupivigafuxasepog.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/49094719135.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/29888827367.pdfIn PDF document text
    • https://suncables.co/images/file/degakefatosobadutu.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/49093676483.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/tufiruzukolojabijuvinuzo.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/fapuxuwunelelavivov.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/9327194025.pdfIn PDF document text
    • http://khocabien.com/uploads/files/gusujisazaz.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/12499308619.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/pejar.pdfIn PDF document text
    • http://lg-palette.com/upload/files/52076306847.pdfIn PDF document text
    • http://wirheiraten.de/images/file/damibiwopujukafarejun.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/limelenej.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/merobedunoxupe.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/monebevalezolegedezur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=three+letter+words+starting+with+uPDF 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_off0000ae58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE58 14408 bytes
SHA-256: d0508a572e241f6dd62210a3b4a22024e73c1d839f8e38bd6afff06a3dfe7cdb
font_01_sfnt_off0000d293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAA 10676 bytes
SHA-256: c2ec53dd587c58502342b5789b963efd5fe81b7ac93d5a506b679d11203c02ca