Malicious PDF — malware analysis report

Static analysis result for SHA-256 de72f5605fc4cc96…

MALICIOUS

PDF

75.4 KB Created: 2021-09-13 01:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4f83aeb66b9018c9eb35530b45d1668b SHA-1: fdbb8a9f37383bb8f4d41964f180812494d7a3e3 SHA-256: de72f5605fc4cc96d384b0a07fd5464dd9a05faf3165741bb8aeab73e50cdc10
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high-risk heuristic firing for a random URL link, indicating malicious intent. The link redirects to a PDF hosted on a disposable domain, suggesting a phishing or malware distribution attempt. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lenaoyunlar.net/calisma2/files/uploads/61060885604.pdf In PDF document text
    • http://canadanur.com/resimler/files/puxezuralowe.pdfIn PDF document text
    • https://razredna-nastava.net/files/80465349266.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe69b0c425---1389003798.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/pizaloforawuligusomu.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/58779904644.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/nivijudogufenizuwadojiva.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/33811655423.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/90806411112.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/fanapujetixo.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/46823554296.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/denite.pdfIn PDF document text
    • http://saktigroup.in/uploads/14922089772.pdfIn PDF document text
    • http://le383.com/uploads/files/66108600488.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/13303329237.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/39081282414.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/93499722150.pdfIn PDF document text
    • http://rc-modeller.se/images/file///kexanenotinadojamupaki.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/62450888698.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/78391133319.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/35480593938.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/juriki.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/ruwasonufegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=download+ebook+titi+sanariaPDF 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_off0000c221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC221 17616 bytes
SHA-256: 86c66f0c30c1468375edfe47aef0572bef386211e23ce9cd0aee4a14cbc98dc7
font_01_sfnt_off0000effd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10814 10560 bytes
SHA-256: 9b563bf573e2c7911e0e10cc904cd93afea06670455d7e3c098f54521c19c379