Malicious PDF — malware analysis report

Static analysis result for SHA-256 657710e8101fb2d5…

MALICIOUS

PDF

90.3 KB Created: 2021-09-12 07:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fba8a4d223b16fb24ed58cefe8e11c8f SHA-1: 06257546b39aa636b8d13bf5a630e74e10930f67 SHA-256: 657710e8101fb2d526d10bcab873acb7f329f64e9cc9ef18ceb7a7c4baeba63c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on potentially untrusted domains. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly suggest the PDF's purpose is to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://innotec-industrie.be/userfiles/file/fukepogotuf.pdf In PDF document text
    • http://dailyxedayhang.com/userfiles/files/jagepisinuzetulo.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/24754374139.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/73929791638.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/pilujusu.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/88716991024.pdfIn PDF document text
    • https://tomas-music.com/contents/files/89391075334.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1046e28db---94323673566.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210911011752_gb4cy0.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/86938237421.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/rabewoxe.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/24537566485.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/94878726398.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/37998366231.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/17789504616.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/soxexamekotabedi.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/40382792440.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/goropidexapozutunixizedov.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/35224178424.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/55076163445.pdfIn PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/29160866624.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/xajab.pdfIn PDF document text
    • http://airmon.hu/images/files/86623642169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=redmi+note+9+pro+max+android+11+update+downloadPDF 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_off0000f620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF620 19792 bytes
SHA-256: 7d30913990d02223b0466d31a6ad003862366e80b50fabd0740c4d7bce845f22
font_01_sfnt_off000129fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FD 10936 bytes
SHA-256: 12c56654e67673d82c68a3a01a82bd06376e53308e85508701038ddc3b7fb3a4
font_02_sfnt_off0001436a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1436A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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