Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ba97362497e981…

MALICIOUS

PDF

69.8 KB Created: 2021-09-08 18:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d6c8c3fb36924fb8d425829ef40be871 SHA-1: 69ff1b9d804b22cf0c1db19c5f0f5aba4f7e2511 SHA-256: f6ba97362497e981d3ec1c55c7ad183256228e600d8f915af35952adb4cc4d89
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The presence of embedded JS suggests potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=contoh+proposal+skripsi+bahasa+inggris+kuantitatif+pdf PDF link annotation
    • http://lyzebrno.cz/userfiles/file/maresofut.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/82848977249.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/jusuvopefawoniperobosezi.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/86844025632.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/559362786.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/34364833047.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/piduzuvafowibarugubolelut.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/wurajugujigovivenofomoduw.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/13471587016.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/74013103701.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210906195623263352.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/88105031150.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/65198681416.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/31389165279.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/semijimabizukuvejuzofutu.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210908012051.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/notemug.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109071804142804.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/lelomu.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613790704473d---39458082822.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46036478314.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/53763707884.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/26102505054.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/jaxoz.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/25708085430.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_off0000b461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB461 14372 bytes
SHA-256: 6ecc3ce2fca494b0bc525713ff80a21c84af868f4bde906310df0efad38182d6
font_01_sfnt_off0000d7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C2 11008 bytes
SHA-256: 3236d0fc27279ad4c9d9fe6152f68d4516db16d585841e45e4adda06da1859af
font_02_sfnt_off0000f0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1