Malicious PDF — malware analysis report

Static analysis result for SHA-256 07c56543c87f398b…

MALICIOUS

PDF

71.6 KB Created: 2021-09-20 20:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c514e1089c6a2750d8902353c8b1d785 SHA-1: 2dac1769d96ade0409f399f2b095894ba679e6d3 SHA-256: 07c56543c87f398be47eb48c62e1ad147a422225dd2c523ea1f6036b58ff0bf1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is designed as a link farm, pointing to numerous distinct domains, which is a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://life-worldwide.org/assets/uploads/files/44949282144.pdf In PDF document text
    • http://verkaufs-akademie.com/userfiles/file/kasevimuvunomuworemonizim.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/pirurupaneloxefaboledi.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/94841619136.pdfIn PDF document text
    • https://parkettworld.com/upload/files/mewazuzisovaposurev.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/67674175270.pdfIn PDF document text
    • http://garderoba.sk/images/_file/zuwijumasubot.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/timuxulodunalono.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/zawobuvotelu.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/99889608072.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/navodipaluzaz.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109132307204167.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/288ec6bb91c69ba4da6d6ed985cae8f3/wudixuv.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/43686411688.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/54667904704.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/xudaburi.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/zowibimux.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/12597184950.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/jakukotujisinafexava.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/11904076652.pdfIn PDF document text
    • http://grupophi.es/uploads/files/butitovikupikitog.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/82395704928.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/sojubaj.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/49998129171.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/24982019381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=atheist+wallpaper+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_off0000b605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB605 16380 bytes
SHA-256: ac7b3305f236bf792c31e524d104f2b55e9b61b751b141a32bd4b9f9698ad914
font_01_sfnt_off0000e051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE051 10556 bytes
SHA-256: ada36423c9ba0452de29d8d0de4748cdafc53034a66160a909ea354df7b88594
font_02_sfnt_off0000f86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1