Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c2be93e8a30a2a3…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 21:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5cf44e526109179147856792e9780827 SHA-1: fce6584a95fc3c68582047380897687d11d6d82a SHA-256: 3c2be93e8a30a2a3c11ea8846d376e341e6f35dd14fef8e1bb8a1dd13ffa7953
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating suspicious external links and a link farm on disposable hosting. The PDF contains numerous embedded URLs pointing to various domains, suggesting an attempt to redirect users to potentially malicious content or phishing sites. While no scripts were explicitly extracted, the PDF structure and the presence of external links strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=the+curious+incident+of+the+dog+in+the+night+by+mark+haddon+pdf PDF link annotation
    • http://iproperty.ae/userfiles/file/mujebej.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/71183658195.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/xaxoruruxilorobewigev.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/37465144227.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/dipaxadagebinewojider.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/wigarube.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9204bbd430e0a279ea015fad4c56dacb/rorusadowazufiwometivida.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/bevab.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/muxaluzuwif.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/70033720998.pdfIn PDF document text
    • http://www.heksan.com.pl/file/13477611140.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/bixigelalatamivima.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/rinefutuno.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/35439507711.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/mumivebot.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/wezateg.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/zuvewofumiselex.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/debojip.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/36880482505.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/47407215833.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/dufawonu.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/3cm16fo95g1958rejos88qd1m2/47421433142.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/26021154443.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/83184192486.pdfIn PDF document text
    • https://avflash.nl/upload/files/12040718650.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_off0000b347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB347 14856 bytes
SHA-256: 533824ab2e7e3e692cc2594547463da2d12a9463e30626c140a00f2e24414e40
font_01_sfnt_off0000d88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A2 11432 bytes
SHA-256: 284dc379b88deb8747f502695b7d9db406048bb59251f660013ebc514440e23a