Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d51573425d78f8…

MALICIOUS

PDF

68.2 KB Created: 2021-09-12 16:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 41177f4eaee632d91968b94650532f2a SHA-1: 43ff28883db42b1bec7e8dc59abbae36ee605ded SHA-256: 09d51573425d78f855333c606e4d52f5caa33b0dfd0dfe9dbcf0f699e0d3b9b0
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only document designed as a lure, containing a clickable action that redirects to an external URL. This pattern is characteristic of phishing attacks aiming to trick users into visiting malicious sites. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://yey.uw52.com/upload/files/nefatopinoposuvosakusu.pdf In PDF document text
    • http://karate-talence.com/newsite/userfiles/files/kadami.pdfIn PDF document text
    • http://vinmexindia.com/uploads/71438954726.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/91274913659.pdfIn PDF document text
    • https://avflash.nl/upload/files/5231724624.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/rokapogizajekin.pdfIn PDF document text
    • http://topstec.com/d/files/pitoxepakerilovuxixure.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/18991852280.pdfIn PDF document text
    • http://deltools.com/userfiles/file/1087719194.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ei7lln7eqqp0bgbblr0g5klug7/46188427444.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/datemuse.pdfIn PDF document text
    • http://domexpo.ru/up/file/wafikisabogas.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/nefevowotuwizixutewizux.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/8048427407.pdfIn PDF document text
    • https://socardan.com/userfiles/files/65712993124.pdfIn PDF document text
    • https://andrejc.si/files/file/labigaremuduxun.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/76247328476.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a72a1ce2e2---50595184403.pdfIn PDF document text
    • https://digireg.li/upload/solipiti.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/todef.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/vozexopenewogijalu.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/wimoluxofobiva.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/79351564947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+know+followers+of+private+accountPDF 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_off0000b07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07A 10808 bytes
SHA-256: cee624e688bd6e00adba808b9c60612047a7a9572781b176982492e74f98a2f5
font_01_sfnt_off0000c995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC995 13776 bytes
SHA-256: ca406e10e05dbddb32160b950ff7e2bda8b7d9399b63436ae0a10116562e2ae3
font_02_sfnt_off0000eb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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