Malicious PDF — malware analysis report

Static analysis result for SHA-256 4743d90517531053…

MALICIOUS

PDF

74.0 KB Created: 2021-09-12 00:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 196e0357c7c17bb6c47d62e12f02a51d SHA-1: bf806e449f7b934743f6fdd4c88b1e93856555b1 SHA-256: 4743d905175310538f204cac85e4cefb7a3daef537c8342e915740c820e373a0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://keystoparadise.com/userfiles/files/64019349711.pdf
    • http://iraneto.com/basefile/iranetocom/files/17873295465.pdf
    • http://www.golfusa.be/userfiles/files/51518632526.pdf
    • http://stnicholasway.com/userfiles/file/bedamujigufupimomo.pdf
    • https://artistprasanna.com/userfiles/file/57878958247.pdf
    • http://staceyasp.com/UserFiles/file/31361497711.pdf
    • http://shiokuda1.com/contents/files/kegozutulifewemutoz.pdf
    • http://shinyoungvalve.com/userData/board/file/xopalomepanezezegejok.pdf
    • https://zhansq.cn/upload/file/48676125349.pdf
    • http://baominhlabors.com/upload/files/67455035049.pdf
    • http://oroblupiscine.it/userfiles/files/65768615930.pdf
    • https://solelane.com/ckfinder/userfiles/files/59709911645.pdf
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/30335127230.pdf
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/jomosipawulufifigowoxasep.pdf
    • http://pusheng168.com/uploadfiles/20210911005638.pdf
    • http://sun-green.eu/ckfinder/userfiles/files/notusepilojele.pdf
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/17504537476.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d18dea1c33---debawegumelewenutitalole.pdf
    • http://mya1fc.com/files/ckuploads/files/bolugusagopowuresalaleg.pdf
    • http://erbaytag.com/resimler/files/58784270673.pdf
    • http://klusjesindex.nl/images/uploads/lidisegamudido.pdf
    • http://agecarekorea.com/ckupload/files/mesitosuloki.pdf
    • http://salwex.hu/file/zobatevulomijesup.pdf
    • http://humansharehouse.com/userData/board/file/85093271453.pdf
    • http://bernendorf.ru/userfiles/file/69024679954.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+speed+up+internet+connection+in+mobile
    • 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_off0000bf85.bin
4ceb9674497efd35ccd6652f934f0014c44e1a2ae41e2a2d5cffe9afe54997ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF85 16344 bytes
font_01_sfnt_off0000e96e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE96E 16792 bytes
font_02_sfnt_off00010185.bin
3e03486f568dd4da3c16a23a2265ef1e15aa15d80757ca99e8af0bcbcab41215		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10185 10832 bytes

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