Malicious PDF — malware analysis report

Static analysis result for SHA-256 e697f2c325e6f283…

MALICIOUS

PDF

71.5 KB Created: 2021-09-10 19:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d8088d19d2c0610c44b78e8285557b2 SHA-1: af63966a735d92098eb543e21ef92af6dc9ba176 SHA-256: e697f2c325e6f2838319a4b78ce026d0035cee0907f5d4ae1f7108cbd8d295ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to link farms on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a common phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://fillaracingacademy.cz/ckfinder/userfiles/files/76759669806.pdf
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/zodibuvonimowaxe.pdf
    • http://medicom.pl/userfiles/file/gomow.pdf
    • http://anpo.vn/upload/files/69264522982.pdf
    • https://www.rapn.ru/ckfinder/userfiles/files/33986628250.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309fe6c30c3---bikibe.pdf
    • https://hanyauntuktesting.com/contents/files/kotekozuzevipusuvefipaka.pdf
    • https://ist-lb1.istanajp.com/contents/files/48768979176.pdf
    • http://bijverhoeven.nl/uploads/files/97439632933.pdf
    • https://riolisboa.com/images/ul_files/file/q7Btc8URHbZn.pdf
    • https://riondene.ch/img/uploads/file/benetorasinopujajowidof.pdf
    • https://hizlipin.com/calisma2/files/uploads/57409093810.pdf
    • http://zap-interactive.com/uploads/files/ruxutevasexiv.pdf
    • http://artdealer.vn/upload/fckimagesfile/1bd59b29357e89fc737354d2653a9617.pdf
    • http://irk-yoga.ru/upload/files/rekavupofoged.pdf
    • http://materialdeestudo.top/userfiles/files/99108599127.pdf
    • http://rockycheng.com/ckfinder/userfiles/files/38979241473.pdf
    • http://health-bridge.in/upload/file/18230041054.pdf
    • http://thinhhoanggia.vn/Images_upload/files/medid.pdf
    • http://tion.hu/upload/file/modopuxudafafedivuzewisuf.pdf
    • https://onhimalayas.com/ckfinder/userfiles/files/lozixiwasemizodexas.pdf
    • https://absoluteanytime.com/media_file/files/files/loximoraxugajumuxirej.pdf
    • https://aeternoplanning.com/ckfinder/userfiles/files/32387817377.pdf
    • http://ventima.ru/userfiles/file/59215443176.pdf
    • http://staractivecollection.com/resimler/site/files/51078196800.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=apk+fortnite+iphone
    • 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_off0000b92a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB92A 16792 bytes
font_01_sfnt_off0000d141.bin
3832c68a34f850bf83f2a9b363951060c06b36bd009cca0bbc4a631481cca70b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD141 10152 bytes
font_02_sfnt_off0000e7e3.bin
dbb58293cd09e65f1cbc53e764582c8b179ef47bd53dfa36db5d12c1f9430f33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E3 15716 bytes

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