Malicious PDF — malware analysis report

Static analysis result for SHA-256 b433c35c00a16b8a…

MALICIOUS

PDF

85.9 KB Created: 2021-09-20 06:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8595d428b15f60d1b800521b5a066a21 SHA-1: c8d7848b9deb95063ec9a6386187dd13d54c7110 SHA-256: b433c35c00a16b8a2ff85b8fad81c119ec14b3f013b2cca61bb84db79bc36d10
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm with numerous external URIs, including one pointing to 'aotwcasino.com', suggesting an attempt to lure users to potentially harmful sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://aotwcasino.com/ckfinder/userfiles/files/74941734995.pdf In PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aae88e6703---2626940575.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210911180843.pdfIn PDF document text
    • https://eurotig.ro/file/pufoguge.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/42517236470.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/55704031319.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/kisefamuzoxew.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/89148464800.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/13234300442.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/36286377198.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/wikitepelu.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/81416044519.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/vumegimovogekagor.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/milufuxeluza.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/tazixowam.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/88945350509.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/62083922332.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f083d1c52e---sizovaboroxitanazera.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/vikejitonakuwakarapuf.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/golivorigi.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/98269513154.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/65426790780.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/83417165137.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/32579522619.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/sumusadalivegop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+connect+to+internet+on+android+phonePDF 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_off0000eb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB51 10472 bytes
SHA-256: ca2a070fffe525b7edf6783e3f94b6c81c589a0c3f6d689bb869b5a3378be58e
font_01_sfnt_off00010305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B17 17832 bytes
SHA-256: edea1cd3c0bbe8d52365a2b7efde87a6104205f2ccc17fca76fedca50ea7ea89