Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b6087d7d07430c9…

MALICIOUS

PDF

78.0 KB Created: 2021-09-12 15:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2f763754ba465010cb2ef9329599f723 SHA-1: 0bc1166d1c318a33932f53a58fe4af7657e25786 SHA-256: 0b6087d7d07430c9b61f1543d52fa960fb8da0804df64f4e8b3bcaead7e1a610
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that impersonates a cloud document lure, aiming to trick users into accessing a malicious link. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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 http://mebizstekla.ru/userfiles/file/57253128410.pdf In PDF document text
    • https://sona3elkhair.com/userfiles/file/89843443520.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/7290610113.pdfIn PDF document text
    • http://heureka-cz.eu/files/redisiv.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/96073170813.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/42428339727.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/valebutifafowajut.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/nuvipakefuxuwanelabifofa.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/kunizakudibuzug.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/jusejakigej.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/80787990984.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/rojigafafajogal.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/62151432172.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210910140612021.pdfIn PDF document text
    • https://shidoremicrosys.com/media/81707966475.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/68750561074.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/satufefamuwedoxul.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/6574766737.pdfIn PDF document text
    • http://emannsltd.com/userfiles/97826474271.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/funukozaronusazijigal.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090800560859.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/barujidirizuxufux.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/55141681100.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/17131078175.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/44434419197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=onedrive+file+sharing+app+androidPDF 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_off0000caa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B9 10768 bytes
SHA-256: 89a0a34ecacf4f48249d2bca547a3deff04382eead3baf6e1bfe8f2992053153
font_02_sfnt_off0000fb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3A 18264 bytes
SHA-256: 0b4f4962f9ae2564b18de43debc8c9c32ed8f61bc0200766d129e9e7f31f1a6a