Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d4bbdc9c9fa732…

MALICIOUS

PDF

71.8 KB Created: 2021-09-27 10:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b40cf0f5ae4ee9c2193ea442a4401d4b SHA-1: 823a6f984a2b7604e38962100f5ff170b13af078 SHA-256: 88d4bbdc9c9fa73294983adfc9d5459b5e82392dd531ac868dbba528a49abaa8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm. The PDF contains numerous embedded URLs, many pointing to suspicious domains, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://cihangirhotel.com/upload/ckfinder/files/13027720937.pdf In PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/gotanupawizaperija.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/57301857748.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/jawovefomivikavowokoxami.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/lovufavakabefag.pdfIn PDF document text
    • https://kaimano.it/file/sinixifime.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/14808547309.pdfIn PDF document text
    • http://terryloops.com/E/file/bifiwime.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/kosolol.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/zarevokunodukibixo.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/17786745411.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/66100532439.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/82678572790.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/wawopidilekovedavu.pdfIn PDF document text
    • https://theurbanthinktank.com/files/72106181945.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/ronuzawugafud.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/m9v97b4g09l3d8o7ptfedn46h2/76394513629.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/ladagu.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/52906814103.pdfIn PDF document text
    • http://snft.ro/media/file/luvenewonubo.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/26875060958.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/31255410514.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/timoxawu.pdfIn PDF document text
    • https://centrehistoriquesndbc.com/ckfinder/userfiles/files/zaxedugevaxo.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/56129427895.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/80338797137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=iphone+12+navigation+gesturesPDF 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_off0000b6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0B 10776 bytes
SHA-256: 48a7a51e1e9da418eefc5442bc3dd316871e8e470fddbd0f2b3453607c6b962c
font_02_sfnt_off0000e7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F2 16324 bytes
SHA-256: c60e247f6685e67dd79f18b9645c41222eda3600b91a2f54025b7af51df8e763