Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd792b0a485ca57…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 20:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48dabe413fdc783b660bdc48da300d96 SHA-1: 45b7e4e1e1d88b0dc0e7b71709dc4d96e238f8df SHA-256: 7cd792b0a485ca577be2e19cc9324c119d9a716403ef9b2eb69c0f06aa3358f9
166 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it uses a social engineering lure to trick users into installing a browser extension or update, a common method for credential theft or malware installation. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites, potentially for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://silver.jo/ckfinder/blanc/files/zifikumifamovis.pdf
    • https://regenerateacademy.com/file/94747849033.pdf
    • http://ccadl.com/files/20210913001855.pdf
    • http://ersatzmonitor.de/userfiles/file/senawapore.pdf
    • http://songhandiban.com/uploadfile/file/2021090503542873499.pdf
    • http://hoadondientu-ptp.vn/images/ckeditor/files/tulujew.pdf
    • http://transchem-tech.com/Uploadfiles/files/ridirupafedogubab.pdf
    • http://podwierzba.eu/ckfinder/userfiles/files/mujefovunotuv.pdf
    • http://tuvanthanhlapcongty.biz/upload/ck/files/tapusurogutupepijovekiba.pdf
    • http://thanhtindesign.vn/uploads/image/files/tevazegeradisoritujejuzet.pdf
    • http://thementalhealthadvocates.org/files/userfiles/file/37468971022.pdf
    • https://alkathirilaw.com/userfiles/files/80337255382.pdf
    • http://artstudiodesign.it/userfiles/files/57315942553.pdf
    • https://fa-vietnam.com/webroot/img/files/boxowurikokimosexabefede.pdf
    • http://cana.vn/uploads/userfiles/file/nogilujuramidozudalutit.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16136ac98c758e---merekegaj.pdf
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/67950967785.pdf
    • http://elpijisystem.com/file/wijetizepokesefud.pdf
    • http://scro.ru/pic/file/dadarikukivaxifafa.pdf
    • http://castudio.eu/userfiles/files/97431624210.pdf
    • https://canevastoilestjean.com/upload/editor/file/2385186514.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=best+custom+rom+for+s7+edge
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d53b.bin
c8dba0dc82a154f5924d4dd2c0df87176412f97e209d4d70b6cf90e9cfee17ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD53B 10616 bytes
font_01_sfnt_off0000ed73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED73 16792 bytes
font_02_sfnt_off00010585.bin
3b24a2481bccf06c04050ab657cc8bf02af74ab380f333fbca00a15e45b8f063		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10585 18356 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.