Malicious PDF — malware analysis report

Static analysis result for SHA-256 b665c50599084808…

MALICIOUS

PDF

84.8 KB Created: 2021-09-24 00:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9f0b392715326d5b60f525a4ba8e1982 SHA-1: 43e4c62a14a1c1f4ff08c83172320b995e94da2f SHA-256: b665c5059908480838192d2726c566e8d638c1c0dd0178c0f7a2840cf3be8dab
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to suspicious PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a malicious intent, likely for phishing or distributing further malware.

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 http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132c7bb5a5cf---41868486412.pdf In PDF document text
    • http://rfinshaat.az/userfiles/file/xiwuxiruzanudiwilogeka.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/kexavejidobesodusewuj.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/71282646185.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/72298485090.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/2cb326885be994833f98e9e3dfd64997/fewofomizisaze.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/80085764115.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/pozidejejirezatamoxokuluf.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/fonevebuxa.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/72883277757.pdfIn PDF document text
    • https://cakkue.com/contents/files/34834585800.pdfIn PDF document text
    • http://rs-entp.com/upload/file/neturur.pdfIn PDF document text
    • http://mutitar.com/user_img/files/fizosotamowu.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/84973904603.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/62122339339.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/xitugosobatojugaludo.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/12236586106.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/70057777021.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/kivewujuw.pdfIn PDF document text
    • http://master-br.ru/img/file/lemabamegejobomijobaxugex.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/68150778057.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/fetibaziriluwubu.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/51664058229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=more+games+like+skribblPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE759 10476 bytes
SHA-256: 613641a11c2f0b7eaba1f89dc31e0ef781d660d045c48f1f0f7b112460028df5
font_01_sfnt_off0000ff2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001173f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173F 17664 bytes
SHA-256: b6ebe5b2288d13089264e754b53a0049b65391f9814e1eaec7934433fc814ace

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