Malicious PDF — malware analysis report

Static analysis result for SHA-256 411fdc245c7a118c…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 15:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8bdfaf0e91a45d33330c9be4e710c35 SHA-1: 7849b9fdf3f21aebbfa4cd6dce0b043632c33819 SHA-256: 411fdc245c7a118c85168af8b1746aaa7665837b54be7b7e10ff0f52b5e80a7c
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to disposable domains, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://drafthe.ru/uplcv?utm_term=orange+and+what+color+make+blue
    • http://avtokit116.ru/!upload/files/lifurag.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331af797318---volenibikodazuwi.pdf
    • http://kleinschadenexperte.com/userfiles/file/68916492514.pdf
    • https://adium.ru/userfiles/file/98543104950.pdf
    • http://live-net.it/file/92451728933.pdf
    • http://nutrizionisti.eu/public/thread/risorse/file/41189544645.pdf
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/87230380846.pdf
    • http://www.buildonhope.org/file/26621868315.pdf
    • http://www.gieskestukadoors.nl/ckfinder/files/files/89918993004.pdf
    • http://dnt-mayak.ru/content/File/56888354027.pdf
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/49881365172.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1c0863cba---tusuxokaluripos.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/42932620056.pdf
    • http://jadeite.ru/images/file/17000954862.pdf
    • http://ingatlantv.tv/userfiles/files/purawokeb.pdf
    • http://tndgdemo2.com/ckfinder/userfiles/files/rojuvu.pdf
    • https://nuttydog.hu/ckfinder/userfiles/files/dazazimawog.pdf
    • http://studioprogettoarchitettura.eu/userfiles/files/36806512872.pdf
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/22682474913.pdf
    • https://emartdeko.pl/galeria/file/38270310438.pdf
    • https://balaji-technology.com/userfiles/file/25066148496.pdf
    • http://metalzilemboeventi.com/userfiles/files/xavofuluwimepagogiva.pdf
    • https://pcetravel.com/files/file/17739569019.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_off0000db03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB03 16792 bytes
font_01_sfnt_off0000f315.bin
a9d6c57ea3c577ade41547fed90cb4bb65140c7b6fbffa6a4b554f81900368d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF315 18600 bytes
font_02_sfnt_off000122e0.bin
a84f0850485bb426ee833aa85c6184019cf08cc52984560b85e7e0705ff83932		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122E0 11000 bytes

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