Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3692ac2ff22e74f…

MALICIOUS

PDF

72.6 KB Created: 2021-09-18 19:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 24d23ebb5d34e5b1c3d7f0f508ad1647 SHA-1: 15752f4d226d46d4108e812a7c2093080f89d1e8 SHA-256: e3692ac2ff22e74f54d08708ba845e44504dff4747209ae7d7f1a105e9d517a1
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 large number of external URLs, many of which are hosted on disposable domains or are part of link farms, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://kaowei.tw/image/files/20210909_082731.pdf In PDF document text
    • http://vangphutai.com/images/uploads/files/jisiwumovuradixakab.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/15953381832.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/bedemenodakufogupibe.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/wunoninapebijaje.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/dejixod.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/sinuti.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/melijopibot.pdfIn PDF document text
    • http://njchemland.com/upload/files/64051846407.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/tezemumunenalavitolus.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/918344168.pdfIn PDF document text
    • http://sergeybazarov.ru/file/luxenodapisomusodofevus.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/woperuvajuromujoxovel.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/zewakalo.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f67f57da0---sijebegatamusovivabemesuz.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/nimula.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/senijatezakisofimijud.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/46042056824.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/22005166329.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/29474067744.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/toxebizapanuwufa.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/wepolorajov.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/22232266548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=sufiyum+sujathayum+mp3+songs+download+masstamilanPDF 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_off0000b6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FF 11388 bytes
SHA-256: 2f5fda28d882317de2c2842a7892a1b579e6ced4d5c931986423962d6818a299
font_01_sfnt_off0000d176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD176 16840 bytes
SHA-256: f4a471f595638c19800abaefb8ebadde93cbafd24779c144258de4b7a8f6891a
font_02_sfnt_off0000fca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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