Malicious PDF — malware analysis report

Static analysis result for SHA-256 b918bdbd9e015f52…

MALICIOUS

PDF

71.3 KB Created: 2021-09-29 04:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6c606f05e720a482230e1175151e11ea SHA-1: 478df0283aa7e734008b920911132f42ae896b5b SHA-256: b918bdbd9e015f527a9d57abd0961c2bdb5e2cd95e99fb0591d4504c93a9fa24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are unknown or point to potentially malicious content, suggesting a link farm or phishing lure. The PDF structure and the presence of external URIs point towards an attempt to redirect users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16150f857c3fb3---33684010926.pdf In PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/fevasu.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/16297762794.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/fejuriwotu.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/xawinogatonosoverajezunuf.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/89265084897.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/47885425777.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/24573561544.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/dafademezomevekor.pdfIn PDF document text
    • https://jfava.gemwareserp.com/userfiles/file/xaraxakudiramefibogekav.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/57548813784.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/43007645640.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/gowibonozefof.pdfIn PDF document text
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/88705293419.pdfIn PDF document text
    • http://jonme.net/ckupload/files/zajovesapefoxinovofat.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/frhusmuvk61p9t7ep96eh71s13/49331924192.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/30687034641.pdfIn PDF document text
    • http://www.polni.si/Images/files/66504279100.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/79879947124.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/65086415187.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/51765590363.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/88761562062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ben+10+xenodrome+plus+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB067 17856 bytes
SHA-256: d23ddcff2342e5dd2129a042d250c1a670b13099f9620472cf5ecfaf0c5a7719
font_01_sfnt_off0000de9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9A 10880 bytes
SHA-256: 430bf3d2b12a55b482c2bc60bf6440353a3b00eed9efd383c9fb0793706104a2
font_02_sfnt_off0000f7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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