Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ba27acb3a89d627…

MALICIOUS

PDF

82.1 KB Created: 2021-09-13 19:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f67f0318449a5ebbbfc7ebe6df4b32df SHA-1: 31c0597afed7517aab5c2e3ca944f91a2214f71a SHA-256: 3ba27acb3a89d627d1e868af6b1e02c2f2ddb3af21742efb0bd519696b000e1b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://coretry.ru/uplcv?utm_term=a+quiet+place+2+full+free PDF link annotation
    • http://positiveforce.in/uploads/files/14255863611.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/linawovegemetimabisa.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/tagomokada.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/36584126845.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/66538885917.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/zozizederifanewa.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/44608970932.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/c217b47aed4d51532cbe7f60fcbf2de0/5147858340.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/68732148262.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/64549751012.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/34929117768.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210906/file/65604646494.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/duxifob.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a6d96933a---60763335610.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/48143675602.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/vazidoritok.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/nofopotusalo.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/42408079190.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/32367077350.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/96813904208.pdfIn PDF document text
    • https://brukspec.pl/upload/file/fosizamagi.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/51093823996.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/fivumomuzefaximawuruzuned.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/fawusobubatelozunezoberim.pdfIn PDF document text
    • http://linker-apps.com/files/mumaliwaxig.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_off0000da5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5D 18840 bytes
SHA-256: 2c868e2612cc3ad442d1b23851403a3dea379fbddb8dc68a516b44faa934d28f
font_01_sfnt_off00010aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12304 10428 bytes
SHA-256: b5cee86726bd4d1e132a90b14f23394b57a5c4ff397c33514a9e21606759e18f