Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ee4456f94909d49…

MALICIOUS

PDF

82.3 KB Created: 2021-09-11 22:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 194879a7cade8aeb6f8721bb78fb9371 SHA-1: 1f1a7ad71f6bd2b293e74dc32d3d9ca50d6e0c27 SHA-256: 9ee4456f94909d494ed991b486a6cec9163747e2b5105bcd55890c6d5ede2e80
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document uses social engineering lures, specifically a fake download button and a browser extension installation lure, to trick the user. The document body is heavily obfuscated, preventing a clear understanding of its specific payload, but the overall pattern suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://obkladlazby.cz/userfiles/file/71828023431.pdf In PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c75dc2ec35---xusidikekole.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/76914183368.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/figemavazaseronidi.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/68990275989.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/63639352356.pdfIn PDF document text
    • http://accronline.com/userfiles/file/92574018378.pdfIn PDF document text
    • https://iohrp.org/f_files/files/zogizo.pdfIn PDF document text
    • http://punaide.com/userfiles/files/jiwiwez.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/jolugikozidalelasafi.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/57666210326.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/60307269219.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/13526040592.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/zeritibukevobeb.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16136cc8662289---kugibekililowizivolub.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/zefajanuluku.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/83962639563.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/19573374767.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/60572734509.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/56699968507.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/keluzibafevitow.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210911_9B971BC8A07ADA3E.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/95894377411.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/44860889284.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/wakexalinode.pdfIn PDF document text
    • https://umutfm.com/resimler/files/domal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=open+my+icloud+free+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_off0000dcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD3 10840 bytes
SHA-256: ccf7ae77d7e4da574c117cf7a8e49f405e379880238fbaac42e584e0eac153b1
font_01_sfnt_off0000f5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D5 17648 bytes
SHA-256: a2cb6fe413535919b8cfcae4355600adda939de4b46c45fc31629fb32b27e7e4
font_02_sfnt_off000123b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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