Malicious PDF — malware analysis report

Static analysis result for SHA-256 d525760cf253dec3…

MALICIOUS

PDF

72.7 KB Created: 2021-09-11 22:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e4bdaddef70ce4f066a59ef063fc2005 SHA-1: b6be6c763b6716c5a4508310581ddb36b8aaf790 SHA-256: d525760cf253dec3aa6c2c0af1c84cb06b8b7645c2c4b2cd07187b9e679f80e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and the presence of many external links point towards an attack pattern involving directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://parfumerieindex.nl/images/uploads/mewilewuf.pdf In PDF document text
    • https://ip-pharma.net/data/files/18712649399.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/4478447443.pdfIn PDF document text
    • https://gilbertems.com/videos/file/faratulokafagobadewoweju.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1630972257_6e20ec9d3a.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/78678752339.pdfIn PDF document text
    • https://pecsikult.hu/files/file/vupakupilalub.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/wumipiz.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/putaxewipenap.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/xosagekatafebariborakeso.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/58603463608.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613750e3af15e---41112898060.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/58764057310.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/72844043945.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/71155968677.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/56932098054.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/4671324245.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/75371781212.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/vinapupokijaji.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/24946575423.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/26630994071.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/59774448019.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/9794961908.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/8d149107a9cee6451985d134a8cfb887/90818037063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=kimetsu+no+yaiba+the+movie+watchPDF 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_off0000b91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB91B 10848 bytes
SHA-256: 2ca89bf133bc7e5b2030f30c9c2ccb7251a512e791dba104116308292196dff3
font_01_sfnt_off0000d218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD218 16624 bytes
SHA-256: 9e71396184021c4ec5a234eb06ead6cf412e04ab43731e5d9030f72e4ac39647
font_02_sfnt_off0000fcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1