Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92266598ff5c405…

MALICIOUS

PDF

81.0 KB Created: 2021-09-21 11:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 21e391ae16765bdb70bd45eb19245869 SHA-1: b6c2f08d006dec204fdcd003a49df42d98cedc18 SHA-256: b92266598ff5c405bce45b1c7c11b7ddb2a641fcdb13aa81afcc1ca5243bc8bf
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm and employs a password-protected archive lure, suggesting it's designed to trick users into downloading a secondary payload. The presence of numerous unknown URLs further supports this phishing and malware distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/99357798057.pdf In PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/34607329027.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/7398518229.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/14009571626.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/jironogubifila.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/zoxaxezolanezup.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/19223149245.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/pabonoxulijukozowod.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/14ebf3abebfc4f947cd271333f36691c/9815836361.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109050913434221.pdfIn PDF document text
    • http://trivio.it/userfiles/files/zagajizepanutof.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/kanobowajinefem.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/fisulajubebeparikadipij.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/pekapipuwizara.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/62705514973.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/6537483365.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/limujalewiwofi.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161497c573a409---94757230422.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/befulodinomebatajoduruwes.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/36925210776.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/biredanubikogifososewex.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/ritelepu.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/vepemaguvinaju.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/61331163864.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ignition+casino+apkPDF 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_off0000d77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77A 10312 bytes
SHA-256: 5482b4fd06934ed0934edb14ce8e9d127ad8b84a2c33aa7c7c8a0832dfddac17
font_01_sfnt_off0000eee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE0 18304 bytes
SHA-256: 9706c459b5058fd03f634e69493b315ad32bea987d2afd35b6da11cdd36cc4a4
font_02_sfnt_off00011e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1