Malicious PDF — malware analysis report

Static analysis result for SHA-256 d00d6fe5e26bd990…

MALICIOUS

PDF

70.8 KB Created: 2021-09-27 18:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e28c80950ae4aca906c7e0d881f19f3 SHA-1: 6404a8766d2c8cbcf480d8886ffd8c8d83fa99b6 SHA-256: d00d6fe5e26bd9901b84ce5a1f8b6cfc6623bfcba2d7e6fb839f6244e710221c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs pointing to external sites, many of which are hosted on domains that appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags the use of disposable hosting and redirectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://giaexploring.it/userfiles/files/37091745770.pdf
    • http://fusiongrup.ro/userfiles/file/71714946126.pdf
    • http://partner-support.net/user_data/userfiles/files/93275101257.pdf
    • http://radio-salsa.fr/php/rs/filesupload/file/74219082104.pdf
    • http://herborgthailand.com/file_media/file_image/file/63867698928.pdf
    • http://megatex-plast.ru/pub/file/lujalaleriledesopi.pdf
    • http://www.polni.si/Images/files/49771091123.pdf
    • https://myshalewell.com/userfiles/file/89931112279.pdf
    • http://xingyeknitting.com/userfiles/files/zixerutumit.pdf
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/26066121271.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139b19c6b048---58161486221.pdf
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/pomemebilus.pdf
    • https://dermatologie-francophone.com/userfiles/file/jigajibe.pdf
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/wuwosowoworamurupij.pdf
    • http://ciaooo.ru/uploades/userfiles/file/55231508404.pdf
    • http://condosworld.com/abisol1/userfiles/files/35157077186.pdf
    • http://hanhthien.net/uploads/file/tefujejowo.pdf
    • http://csim.jp/ckeditor/uploads/files/90272420656.pdf
    • http://stefanourso.com/public/userfiles/file/gunekefadidifujurimaposi.pdf
    • https://internationalmedia.com/userfiles/file/46325211177.pdf
    • http://music-summer-courses.eu/upload/files/rupuluw.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/bbf0317e9ef0172f2f3bab6be668c4e4/nudoto.pdf
    • http://muzeumostrowiec.pl/obrazy/file/49032696420.pdf
    • https://tecnicadovolante.com/images/file/28489946836.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=five+nights+at+freddy%27s+custom+night+free+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_off0000b26b.bin
ebe15a13091f00135e8cf8296fcef61c6e42af03270735db8325cf5cb152df6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB26B 16036 bytes
font_01_sfnt_off0000da78.bin
9f643a5475023d68259ccc8153187cf02ff388cb624a4cd0f85a4389e4877cdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA78 11300 bytes
font_02_sfnt_off0000f4c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C3 16792 bytes

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