Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3e3f47365816f0…

MALICIOUS

PDF

78.9 KB Created: 2021-09-19 04:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4472fe0d4a4ca6aba75ef0f1dfc1b0fd SHA-1: fe15af0eef7baf4585efd1d0bc69fb3e4f5dcd55 SHA-256: bb3e3f47365816f0596c1224eae1fdec7048ab187a63850c65395d359819bbff
134 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or spread malicious links across many domains. The embedded JavaScript likely facilitates the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://freeorden.com/media/file/71558597403.pdf
    • http://detikakdeti.ru/img/file/xuluputarutawon.pdf
    • https://gianlucabruno.it/dati/upload/file/6198169168.pdf
    • https://leise.ru/admin/ckfinder/userfiles/files/94950524144.pdf
    • https://poojaindiangrill.com/nbloom/fckuploads/file/44164841105.pdf
    • https://aquaprosmart.com/userfiles/files/ditidivasabad.pdf
    • https://ibextrail.com/editor-images/fakekiwe.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cae110b0ca---3633519128.pdf
    • http://kartywspomnien.pl/uploads/assets/file/pubaselijivasojupi.pdf
    • http://cambresisemploi.fr/ckfinder/userfiles/files/55689040196.pdf
    • https://e-tta.com/app/webroot/userfiles/files/daretedezugameni.pdf
    • http://cx-gl.hu/images/files/zuboz.pdf
    • https://yellowstonewildlife.com/tukasamusi.pdf
    • https://gikguamerica.com/userfiles/file/4368293707.pdf
    • http://footstepfloor.com/upfiles/files/11087429862.pdf
    • http://lamachine.nl/userfiles/file/85105687835.pdf
    • http://sushrutproctology.org/ckfinder/userfiles/files/vebowufixelewexabejexubo.pdf
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210901101557663387wc8oo8.pdf
    • http://huijingweb.com/upload_fck/file/2021-9-19/20210919052922135597.pdf
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///zimajobiw.pdf
    • https://euroialinsol.ro/userfiles/file/64501040609.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=android+games+on+ubuntu
    • 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_off0000d2b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B3 16792 bytes
font_01_sfnt_off0000eac5.bin
a208a4e99bb12bc68792eaf8880d60cd83ae01bf3f082b1d202edcca26d02df7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC5 16600 bytes
font_02_sfnt_off000115e0.bin
ece4e687f33917fa2d460ed20d11c72b0ccc593f7b04742d9a837105430aa245		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115E0 10768 bytes

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