Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e041f8cdecb404…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 00:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 661816760f51c47a40c4b82e3dac4b5a SHA-1: 3c77cd5d5b94cc301181fd278075587540c5a1d1 SHA-256: a3e041f8cdecb404f36b4244bade90f59b3b4100f0fde6cc3d4cf83c3b73ae55
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to direct users to potentially harmful content. While no scripts were explicitly extracted, the structure and heuristic firings indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://gpp300.fr/userfiles/file/71491563556.pdf In PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16139388114fb7---64396787802.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/vidufikumadogena.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/rajen.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/kawexiguwijanubowazof.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/duzijefowozuwedoninejetak.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/fileserozedukej.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/tetonimizegusugar.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/buxuxojopijuwepa.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/6ec4ebc06de23cd936629d2b4aada4af/96975202230.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/xapazifopowu.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/99014619834.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/judow.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/15550337405.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/96185837847.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210905_6ACF3B35820571A9.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/23985684306.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/pesibowekenisasumixozijax.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/96078671634.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210915205355.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/tajafepidufit.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/sorajatuzajelatejaw.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/mokak.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/tigivoxusofinimuxov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=traduzione+pdf+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_off0000e159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE159 10304 bytes
SHA-256: ac48556932b56bbcf4403083bb62f1c0d6fbad7f7fb8e0eaf21c692e37540c4a
font_01_sfnt_off0000f89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AD 17512 bytes
SHA-256: 971dcaaca5332e50b8bd3bed8036436a6261cf2b076a3ef7782a2d852573486d