Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea26278621b877c0…

MALICIOUS

PDF

78.0 KB Created: 2021-09-20 14:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1f801bb3220d0711758a633da9afeebb SHA-1: 4c2a3b9b66c609b9b0b29c6c95bcb07ce8728788 SHA-256: ea26278621b877c0d23f3e386637fc583ada5ad7cad35be6757cdf0d366aa778
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many pointing to PDF files on disposable or suspicious domains, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate an attempt to host malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://shouce-image.kuchuancdn.com/Public/resource/files/65711964220.pdf In PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210919_010A2333B0E95105.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ccc051149---famaluwuzenedufix.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/52592222684.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/nowobuvavadavokif.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/rigedezimexixu.pdfIn PDF document text
    • https://attack.lt/images/files/94958054641.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/76540000594.pdfIn PDF document text
    • https://ijpdua.com/contents/files/9604774727.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/luzula.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/wojujulake.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/susigolazabekojobipaw.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/fomadedozamekufebutasajob.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/81389178370.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/jajegi.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/sutizibagunufer.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/fisujotamajareropis.pdfIn PDF document text
    • http://katela.net/userData/board/file/90433884637.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/nesezefofelafefivifojevo.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/92504190948.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417d3fd346a---68022604507.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/jedezizuzufatobuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=idm+license+key+2020PDF 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_off0000cc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE472 10448 bytes
SHA-256: 8d901d7061c42efa123eca42b3598ba7a5ed55cd0c17312589723be92b43a698
font_02_sfnt_off0000fc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC24 18060 bytes
SHA-256: 000698aad81576ebaa3d5269a50300df00576ae03357caf904ec1fbc61e4fed6

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