Malicious PDF — malware analysis report

Static analysis result for SHA-256 7223caea0d685bc0…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 09:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1a4316730f95c1e14ecb5bd7c6225989 SHA-1: 86f7d7b3110724c1e389ce98d8d7daf25910b517 SHA-256: 7223caea0d685bc0edd85001ae178b312ec03b80562d6aec7597a76a09698863
166 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery attempt. The heuristic 'SE_REMOTE_SUPPORT_LURE' strongly suggests the document's purpose is to trick the user into installing remote-support tools. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing campaign potentially leveraging embedded JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://krisoc.ru/uplcv?utm_term=server+android+remote+control PDF link annotation
    • http://residenceraffaellotorino.com/userfiles/files/72333557467.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/7957060026.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/mowibiba.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/93950298155.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/zadozawijujuw.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/81101001398.pdfIn PDF document text
    • http://proxima-online.it/public/file/22669447355.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/budunuzamelifazuti.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/mosejowedu.pdfIn PDF document text
    • http://popmetre.com/news/files/93107486925.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/26686460310.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/nubedutorove.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/36515732623.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/90127201811.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/judovujakizikaxagujebu.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/12848945568.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/mafikunelete.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/kewabexike.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/24686518436.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131b2647b527---56825760267.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/tirurama.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/77121941675.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_off0000df3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF754 10504 bytes
SHA-256: 5664c4be4626faffa0f57c68120e3ebfaf1bab37583d857ee21d8910bcc35e1b
font_02_sfnt_off00010f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F37 17120 bytes
SHA-256: 841e67865ff2cbaf8585859f2d96958770145e09906a9caea744cfedca4eafb0

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