Malicious PDF — malware analysis report

Static analysis result for SHA-256 92905112a68355a2…

MALICIOUS

PDF

92.8 KB Created: 2021-09-09 23:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2655d2be06abcdd057173bd6512cad84 SHA-1: 562d3ac563919422036da3bc6f4161ca47573cab SHA-256: 92905112a68355a2a1b3b58aa289a17cfbdf75481aea210cb31e6ee20b6709cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://coretry.ru/uplcv?utm_term=how+to+get+free+robux+without+signing+up+for+anything PDF link annotation
    • https://smartstone.ca/userfiles/files/79516536031.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/90572386726.pdfIn PDF document text
    • http://c-six.it/userfiles/files/zixufuvavomivugejos.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e0b2f1d79---34745130442.pdfIn PDF document text
    • https://network-italia.com/file/lixex.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/78077126870.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/17398935657.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/wazazeku.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/91353527781.pdfIn PDF document text
    • https://urologasdainys.lt/userfiles/file/lakuvemarogejinikud.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/70432292984.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/venifipekupozanilofumo.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/suliwi.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021090615841_762918547.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/54681069322.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/kumewupedinujetuse.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/fatemutokanajezuxuzutozu.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/lagaxavojupisaratudezozu.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/53248613490.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/44783725326.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/pivuloxulenasidupimetudo.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/mekibowin.pdfIn PDF document text
    • http://zubrcup.by/files/files/18207902490.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/kezob.pdfIn PDF document text
    • http://epmachine.ru/d/files/22803310132.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/84457933807.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/71669572294.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_off0001020a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020A 18776 bytes
SHA-256: f5352d7ee44fdab4f5d0efb1f2f6d7833db35a2bb1b500184283d7bc23a3c5d3
font_01_sfnt_off00013266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13266 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A7D 11124 bytes
SHA-256: 213ceb82fa71550d22e8c3602c5043dc98c589688008479f598d8f58c48a0f2d