Malicious PDF — malware analysis report

Static analysis result for SHA-256 339a0585b8d31b78…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 04:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d2137498c41e1379a687382cb850dea SHA-1: 3a6b93cca2844c5ccd24d024490d8601cf8dcbde SHA-256: 339a0585b8d31b78cf09ddc41beca0e5b8efd0e4a962a0b7875eab0e014a5fc9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to link farms hosted on disposable domains, suggesting a phishing or malware distribution attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies the document as a link farm on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://allytemp.ru/uplcv?utm_term=shadow+fight+mod+hack
    • https://invision.buzyhub.com/files/jitefisewamavifunevano.pdf
    • https://caror.hu/ckfinder/userfiles/files/fefapugoxiremupur.pdf
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/14421245665.pdf
    • https://semot.com/Store/userfiles/file/vawudenukujemejuguzejub.pdf
    • https://signika.pl/Upload/file/81864091484.pdf
    • http://17njl.com/userfiles/files/gasefefevogibudixobogip.pdf
    • http://laclonghotel.vn/upload/files/vumizevila.pdf
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/68189029907.pdf
    • https://dukeofmarshall.com/ckfinder/userfiles/files/46604181788.pdf
    • https://foundryindia.org/userfiles/file/tozuperiwudoj.pdf
    • http://chinastom.ru/userfiles/file/36184859871.pdf
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/pogemufitosakufumuw.pdf
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/boxivatijog.pdf
    • http://pooq-design.com/app/webroot/fckfiles/file/21031779387.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348e35f26d9---dufolejax.pdf
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/vuwilesasarole.pdf
    • https://crownprolaw.com/userfiles/Proj_Name/files/fedozajulajuvinexusijig.pdf
    • http://desiaussies.com/ckeditor/uploads/files/xitegabakufefewukodunotu.pdf
    • http://zensushidanapoint.com/uploads/files/39478617521.pdf
    • http://eaupureinternational.com/userfiles/file/39590018491.pdf
    • http://songpinhao.com/userfiles/files/wakixonuwuxoref.pdf
    • http://flagrant-desir.com/userfiles/file/kudunulomelosogowipekiwo.pdf
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/58646675157.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_off0000db6f.bin
437b36ec0a3dd804c6738a43deafc6ae4b9ee0f94795914b61418b0e0bd7ebf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6F 10624 bytes
font_01_sfnt_off0000f39c.bin
1871daf02ba5b28dab46821677bfb0c6df7eccb2841bf2a96362ac09115a3630		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 18108 bytes
font_02_sfnt_off00012330.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12330 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.