Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea92c12c9814a300…

MALICIOUS

PDF

79.2 KB Created: 2021-09-18 20:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ae3b52532eede8577cc8a3bdf1951f91 SHA-1: 7e003885503fc120bd4117c6c404b36e47c1b267 SHA-256: ea92c12c9814a300c4619bbfd5901d88d277ee8df5976ce9f613f369c1cda312
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically flags this behavior. ClamAV detection and ML classification further support its malicious nature. Although no scripts were explicitly extracted, the structure and URL patterns suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://smidgel.ru/uplcv?utm_term=8+ball+pool+auto+aim+hack PDF link annotation
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/samubilula.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/luvitirawunilafapazew.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/81298682741.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/nuxosigediw.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/12588154760.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/79447480639.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/96273207062.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/41338191455.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/xuwuzosisezini.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161333e1acf922---tuwajimukotipoz.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/jovamiterukizagokutuv.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/52ba12d7027c38b6aedeb03de81b5bf3/20947796801.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/jofukinewusax.pdfIn PDF document text
    • https://heureka-cz.eu/files/84082601307.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/zeforopogirudokove.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/56821383825.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/71253218592.pdfIn PDF document text
    • http://eva.am/files/05b87bc353b9b81d.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/91756853232.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/vumetojexonobonufo.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_off0000ca39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA39 20712 bytes
SHA-256: a58d30fb2c17f99e5ac7c09b1869d641c9d6720a798764a74663f6d89fa5922c
font_01_sfnt_off0000fefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11715 10576 bytes
SHA-256: 06fec1bb25bfae462eda01492172bad0be19f56cd21101a584313f84690b4146

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