Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e7421797b2e0cbd…

MALICIOUS

PDF

81.5 KB Created: 2021-09-09 18:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 68e2497b339f0d26474118f3b6cca7b7 SHA-1: 66b86c2457f5f817c5027041eb8108419d10fc18 SHA-256: 9e7421797b2e0cbd7b7804ce91297d14718cb380b8c9eb9762af09ea981629bd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external links, many pointing to PDF files on different domains, suggests a link farm or content distribution network. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for link farms. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggest it's designed to direct users to potentially harmful content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://lufty.cz/UserFiles/files/sazadepapefivetiruf.pdf In PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/11307561237.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/jotiluzomoribojemorate.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/24022612032.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/36801097497.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/zesabexuvetiborari.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/66769041136.pdfIn PDF document text
    • http://chamdure.com/DATA/files/xituj.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/96823693480.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/57562508726.pdfIn PDF document text
    • https://mashura.co/userfiles/files/63486380138.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/38906641127.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/koguwujegodupolagedev.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/gomuluzabok.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/78864246832.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133b4ecbb12b---21795018010.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/renijumuxikazafuk.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/98760600703.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/29526562989.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109052205436851.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/sibekajagexezasev.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/79328408277.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/nekafafuxalemuna.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/wuxediru.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161305d5ea064e---38437403716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=my+family+cinema+free+trial+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_off0000d68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 10552 bytes
SHA-256: 3511fc7ef95db6548c68a3112799d52c6cfd22a46292c394dfb6206e8e231e44
font_02_sfnt_off000106af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AF 18976 bytes
SHA-256: f0bdb77f09788841146b6f03d8c3d13fd1c7bbc6e77a24c3d42c082938a50a30