Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ca553a8b12f8b7…

MALICIOUS

PDF

69.4 KB Created: 2021-10-05 22:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b9be585bef7c5a7181084cbbc881dab4 SHA-1: 5ff47059906c9fb90d7b150084a2e333ed1b0703 SHA-256: 41ca553a8b12f8b783f7db9deeb2e5aea6eaf1b11e698aa16dbb0995c7908c21
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URLs, suggesting an attempt to redirect the user to malicious sites or download further payloads. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, reinforcing the phishing or scam lure. The embedded JavaScript is likely responsible for initiating the malicious activity, such as downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=functions+of+a+financial+analyst PDF link annotation
    • http://cardealer-space.com/js/upload/files/6459076395.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/berekute.pdfIn PDF document text
    • http://sro52.ru/uploads/files/milojezadoxibakat.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/loneraluz.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/mipabaf.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/55197492810.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/18662769930.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/85080774473.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/xakasevavaleli.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/17924897446.pdfIn PDF document text
    • http://schokozentrale.de/idata/14819949943.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/niwuwu.pdfIn PDF document text
    • http://tipiland.net/upload/file/gumaxumotazusiwigilebe.pdfIn PDF document text
    • https://susta.vn/userfiles/file/ralusakuzutazafe.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/gfv8q8jk3b2v0k8jnrffp85f40/49964669399.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/dirujiloz.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/30903097103.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d5f62b8610---18728943439.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/gomatefajuxifigusagoj.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/7928124798.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/vaxus.pdfIn PDF document text
    • http://www.centralperdana.com/file/51040539800.pdfIn PDF document text
    • 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_off0000b07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07E 10288 bytes
SHA-256: d22a1a4ee876fdcc38642f6ebbce893f7ea35f3adb1cd9ba7d7f9972b66bba0b
font_01_sfnt_off0000c7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEB 15808 bytes
SHA-256: e2815784c2d6337dbe50f7200df179cbe8699950d04d339b2aaa440b75dbd58b

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