Malicious PDF — malware analysis report

Static analysis result for SHA-256 824bca11c4604bff…

MALICIOUS

PDF

82.2 KB Created: 2021-09-12 04:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 844c3880e60f30d333d6e3a1edaefb74 SHA-1: f7344cd9c23215e30c6d42be840e5f78fa33772e SHA-256: 824bca11c4604bff8b69ab96080c98d6ac0d272ec5911cd842ddef18237aa6cc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of links to distinct, potentially disposable hosts, suggesting an attempt to obscure the true malicious destination. ClamAV also detected this as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://gastrotest.co/ckfinder/userfiles/files/risawozasoxafani.pdf In PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/31791276242.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/27737654806.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/86671029550.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/30775122089.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/nizadoponuped.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/nuxedofoxoluderowij.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/dosavumok.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c138c78cee---56065406190.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/bolufuvulenalumokovegoja.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/24417740180.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/gojitinite.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/97114246185.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/43623399102.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/32171784313.pdfIn PDF document text
    • http://clingac.es/d/files/9605190864.pdfIn PDF document text
    • http://standdominica.org/files/files/41460294259.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/62374779625.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/79088908027.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/povakakatox.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/95618205048.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f21716bee---99195477637.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/49631381071.pdfIn PDF document text
    • https://ags-car.com/upload/files/sitojirawo.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58865638672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=bubble+bird+rescue+mod+apkPDF 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_off0000d99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99D 18984 bytes
SHA-256: 49d000ae5b14983a5fd527219db9ce356d9e20b03800f77748b649339ecc9131
font_01_sfnt_off00010ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CF 10856 bytes
SHA-256: 5ae3c9b76231ce68dddbd1370ab8440e4b80f6ff15ec8235c6bbc07a5daa468b