Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfaa95f1ea72a44a…

MALICIOUS

PDF

74.9 KB Created: 2021-09-11 04:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93c3306772b9cec1326668a806fcba79 SHA-1: f41b9a0e038dddfc778fc57d41998d5426704d4e SHA-256: cfaa95f1ea72a44a7fe8b24c4f013667aa28ff1faab6f396a23ebc1f4e100ece
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xz-brand.com/ckfinder/userfiles/files/95300227027.pdf
    • https://lescourailleurs.com/upload/editor/file/xozidobikelu.pdf
    • http://skolicka.eu/foto/images/file/tatugikugerami.pdf
    • http://sdes.in/uploads/sopevotaxibav.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/945501e80dbfb597b9ab73b84a370902/xefozudobumulobet.pdf
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/55536108418.pdf
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96975910156.pdf
    • http://djpress.pl/Image/files/zarojazidojotivo.pdf
    • http://jessie.vn/images/ckeditor/files/pejugopajavawusevodezeti.pdf
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/tosizitubomema.pdf
    • https://machnik.net/ckfinder/userfiles/files/palubilajujulenexot.pdf
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98633132962.pdf
    • http://madurastones.com/userfiles/file/zezikotalol.pdf
    • http://jun-travel.com/userfiles/file/86673613216.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c01d7313f---xisumafa.pdf
    • http://playoz.com/ckfinder/userfiles/files/94119666827.pdf
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/8809739033.pdf
    • http://volkshilfe-vlbg.at/images/content/files/puxevegisijifekaxamumi.pdf
    • http://year-c.com/upload_fck/file/2021-9-10/20210910180146467031.pdf
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/loviveb.pdf
    • http://thebankcardservices.com/uploads/files/jabajonopokivonage.pdf
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/85668704913.pdf
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/kawizigoxebamig.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=don+mock+the+blues+from+rock+to+jazz+pdf
    • 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_off0000bffd.bin
a022e87daaebabada359850cd8cee116f998e546c7334650837079078f39ddae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFD 16740 bytes
font_01_sfnt_off0000eb2b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2B 16792 bytes
font_02_sfnt_off00010342.bin
eb0abc4d4d9f5a5f7df000edf53148b1bb51258c4ad1f4b4d4713c39b9512e93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10342 11316 bytes

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