Malicious PDF — malware analysis report

Static analysis result for SHA-256 79fb245dad7dd778…

MALICIOUS

PDF

69.6 KB Created: 2021-09-29 03:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d771580c9172b9e9e0d5530efa47c1f0 SHA-1: e618bc47afe85fa0ea5021315adbdfa51d1c367a SHA-256: 79fb245dad7dd778020ee1bf9d4e7c96d321f4bf5bd1fdc497a3448bd775641b
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on suspicious domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sushi-belovo.ru/files/29682291996.pdf In PDF document text
    • https://contemporaryteas.in/admin/uploads/file/33156394649.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/43791218923.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210913_7ED0A3306AB09094.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/xabetagesuron.pdfIn PDF document text
    • http://becucci.it/userfiles/files/xorizatoj.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/zobaninarilidolej.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/1866932647.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/bipenunapenakasudi.pdfIn PDF document text
    • https://aedwea.com/upload/foto/janivonenizixupegux.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/35504959520.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/bilumigesipusugipowewuk.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/19832105377.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/3a1ada2e6daf01a3e3fe992d8f37b26a/6866099422.pdfIn PDF document text
    • http://cartopack.com/Images/file/wovobemaxan.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615289af08e51---17206112652.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/44664836445.pdfIn PDF document text
    • http://jswenguang.com/uploadfile/file/38185827656.pdfIn PDF document text
    • http://thumuavechai.com/vietkiendo/upload/file/dikawotivofe.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/8251731859.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/rikemoligirowavo.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/76391001168.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+get+all+my+apps+on+new+phonePDF 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_off0000ad25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC537 16936 bytes
SHA-256: cda181473a9bb4457e52facdba24b2f10d490ae002a5ec6f5af2644aa42d8130
font_02_sfnt_off0000f066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF066 10700 bytes
SHA-256: 78aea34ee095588268c792b54f84a9cc73923d17e83a5c5e4b42f28c9c288c0c

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