Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ee3e7927d0007c8…

MALICIOUS

PDF

79.7 KB Created: 2021-09-23 02:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: be9222cb3f8e594381ba62b741ad8b62 SHA-1: aa15528cd06fa2471398f019c08ddf211ef54a9b SHA-256: 9ee3e7927d0007c8607d6321280dcb7f7066fb92552513b5d736ac698047da5f
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning model and ClamAV, indicating malicious content. The presence of numerous embedded URLs, many pointing to disposable hosting and using UTM parameters, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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=problemario+escolar+trillas+5+pdf+gratis PDF link annotation
    • https://gym-rectif.fr/ckfinder/userfiles/files/dolinovaxubanupenobokori.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/20784326719.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/58740030436.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/gowawise.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/92595110523.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/99407822442.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/lutenimumisagad.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210919062953-29075358847.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210923064538.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/85355408397.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/1979437646613600ee88c13.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/12240797064.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/70841002961.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/dinunolawuk.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/16892910176.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/3912eacb81c3a588e5ad350d6dc3e4c1/54245235556.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/73150944231.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/87242367358.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/38205533554.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/sitafozopa.pdfIn PDF document text
    • http://dakov.hu/_user/file/rukibil.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/31106802294.pdfIn PDF document text
    • http://askort.pl/Upload/file/kobavatogozivofig.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/bojolopeporexewilevav.pdfIn PDF document text
    • http://mobiliteit.nu/files/3596695789.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_off0000d17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17F 18168 bytes
SHA-256: b388c60fa36c2f18a26bc096062423c4b3de192b8adeb1d6b6b5010d5e8f5c15
font_01_sfnt_off0000ff2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2B 11132 bytes
SHA-256: f5e571e991ffac8022fac886b6e2629d09bbdb6321720bbce0a41fd765b175a3
font_02_sfnt_off000118cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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