Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8fdd9b1d4de4b0e…

MALICIOUS

PDF

81.6 KB Created: 2021-09-09 06:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ac09606b006e65479753813684f6c194 SHA-1: 00758131d808ef28b92a9efc3d07bd8c67a012c4 SHA-256: c8fdd9b1d4de4b0e5c113dd1c2294e1636591d306dd159558d198261e3a17443
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains multiple links to external websites, some of which are algorithmically generated, and a heuristic identified it as a link farm on disposable hosting. Notably, the document contains an instruction to disable security software, which is a strong indicator of malicious intent. While no scripts were explicitly extracted, the presence of external links and the security bypass instruction suggest it's designed to lead the user to a malicious site, potentially for further exploitation or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/gajewu.pdf In PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/milipakememekenivatonesam.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/25556752378.pdfIn PDF document text
    • https://oasis-travel.ro/files/wevonigaz.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/rofataxotimapiwojaz.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210904021918969.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/82093446632.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/toketu.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/50684795030.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e856bed63---95843705964.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/luzeridupadalobira.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/nurajexazepugekavulugoba.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613521b2aff81---tabunuwigisubasiloko.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65626538315.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/29684634784.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/85786077463.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/rumibukenusuguferanomux.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/waneganujobane.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/wilomakewowibubesile.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/92856827775.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/dijasugafoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=fortnite+softaim+free+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

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2C 17468 bytes
SHA-256: a852c4b03ce7d45ba51e0a67117346b68e70a4a7e48ef8c761e7efdf4fcfb107
font_01_sfnt_off000108a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BD 10580 bytes
SHA-256: b78acf861d483583e013b3cf94778816423e54ca4bd055a105f50c6bd5b42cfc

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