Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4629f8af121cb8…

MALICIOUS

PDF

72.0 KB Created: 2021-09-19 04:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7519e52dc976e72fa47848b58797a167 SHA-1: c74bae773b7ab443ddb2b89649d49cfab6ea395a SHA-256: 9c4629f8af121cb82bfb8a73506724b8efda5378276878d728de00c7086e5e0a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The 'SE_REMOTE_SUPPORT_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing or running remote support software. Numerous URLs were extracted, many pointing to PDF files hosted on potentially disposable domains, indicating a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://pixomot.ru/uplcv?utm_term=android+locked+up PDF link annotation
    • https://alshuka.ps/ckfinder/userfiles/files/27899674073.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/sinukumudejugotezugasu.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/90111340862.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613c09c150cda---ketifadedakoso.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/48771921388.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210907155406.pdfIn PDF document text
    • http://sdes.in/uploads/jipofunibiga.pdfIn PDF document text
    • https://sitarasign.ir/data/file/49871389174.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/batovugimutun.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/pupusogaxejo.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/b32e79e85de2ad4da427f7c9dcfbfe17/18981884681.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/80386470052.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/zegapidulogewutoraxiji.pdfIn PDF document text
    • http://airfa.it/userfiles/file/kebixefusezefez.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/44036786981.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/gelixo.pdfIn PDF document text
    • http://sjanzee.nl/file/57824583396.pdfIn PDF document text
    • http://artospace.com/pics/file/3333457540.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/rutuw.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/jajewenavodid.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/11321505489.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_off0000b9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D5 16392 bytes
SHA-256: 6ecb9e50b8386ca19e269c33e84128961ef02fcf88bbe923b4275ab9280b18e1
font_02_sfnt_off0000fbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEB 10252 bytes
SHA-256: ca8cf8ada1823379e13e107c439039f4c30485df4ec0aa03246c910a6a8116dc

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