Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e2f051a6908b49e…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 00:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ab0ff52aab73f312d1384cfaf48dc7fe SHA-1: 3d6192be3340f928ade1cdb7b8f8804a299711ed SHA-256: 2e2f051a6908b49e5a511b2c90a819e3436aa187a27651d1a4d612d0dcaa5cfb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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.
  • 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://orkoien.com/userfiles/files/nibimuwijomitopup.pdf In PDF document text
    • https://resttour.com/images/userfiles/files/32613017580.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/14206868153.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/sotoviminemakire.pdfIn PDF document text
    • https://digireg.gr/upload/pujofaviwolib.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/gizimobudelode.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/mabisanaxavakep.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/dupotofodexarovirabusa.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/693e3f3d8c2520826cdc09d0f79d1b01/11381376190.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/fokijejupigoromejurive.pdfIn PDF document text
    • http://dsfly.com/uploads/files/17176830314.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/8185577083.pdfIn PDF document text
    • http://origo.ws/userfiles/file/65543385287.pdfIn PDF document text
    • https://roarmysecurity.ro/mm/file/63987961361.pdfIn PDF document text
    • http://lukinserv.hu/file/7673731254.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/sunivavabesibeb.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334b3f8d110---25922367616.pdfIn PDF document text
    • http://salwex.hu/file/55611072824.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/somit.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/mekazelikudavapu.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/98221169239.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/59854312368.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/pakuzibapifazev.pdfIn PDF document text
    • http://elsped.hu/files/file/46752133186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=search+messages+androidPDF 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_off0000dfcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCC 17176 bytes
SHA-256: 8a267d00d83ada7283451efcf424f045a3f4403efbe73bc35bfc1fb97544274d
font_01_sfnt_off00010c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C34 10748 bytes
SHA-256: 3aab36df3855b7c263a433bcc2da8487de4633b4e60d7890713dfc5abe4e2564
font_02_sfnt_off00012478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12478 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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