Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f2861fe10c1e86…

MALICIOUS

PDF

70.0 KB Created: 2021-09-27 00:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58b53df133e5a77d70529d205e2c9b46 SHA-1: f9052f45877269c6ff4531d165f709499b195d63 SHA-256: b4f2861fe10c1e86a89d9a4fe292f96045c0086b87388319f5359f2ab0835841
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 part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/62127266235.pdf
    • https://mattress-leader.com/media/17531720480.pdf
    • http://chipublichouse.com/ckfinder/userfiles/files/nokapewa.pdf
    • http://ecoaga.com/documentos/file/18844146254.pdf
    • http://primaria-ciocirlia.ro/media/file/nujol.pdf
    • http://autoklej.pl/app/webroot/media/files/93525163232.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462c10e2eda---86758168406.pdf
    • http://studiolegalebisantis.it/userfiles/files/mabumonutejenakame.pdf
    • http://dycelife.com/userfiles/file/3390853875.pdf
    • https://www.aicsmindia.org/ckfinder/userfiles/files/wunotej.pdf
    • https://phuquiland.com/upload/files/55199847480.pdf
    • http://tatooazh.ru/files/files/raxejuzanezizumedikabu.pdf
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/63115947629.pdf
    • http://dreamwith.gni.kr/ckupload/files/patojepanipajonepijulog.pdf
    • https://llbyggodesign.se/UserFiles/files/vogatemetawijom.pdf
    • http://www.w.radeton.cz/ckfinder/userfiles/files/81984358040.pdf
    • http://alfonsoguiggiarchitetto.it/userfiles/files/mofaviwago.pdf
    • http://iknow.pl/files/file/87659291627.pdf
    • http://wsospice.org/uploads/userfiles/file/file/62378573240.pdf
    • http://gzmzwl.com/Uploadfiles/files/bazigezozaloseva.pdf
    • https://www.iieng.org/editor/ckfinder/userfiles/files/85293491087.pdf
    • http://fd-health.com/upload/ckeditor/files/kabona.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/99d91baa73a7a9459d87800378c0f5a9/waravemupimukawi.pdf
    • http://micruts.org/userfiles/file/21020059448.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ps5+emulator+beta+apk+download
    • 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_off0000aece.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAECE 16792 bytes
font_01_sfnt_off0000c6e0.bin
db2228a7feca2c0187a91c0ff38287a547e0a4ace65f56a888333b7f094d4b0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E0 15908 bytes
font_02_sfnt_off0000ef72.bin
59989c8db266424e62942c8d6d14deea2c82325545d1337cc7f31820064b95ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF72 11012 bytes

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