Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef51fada2f5bacb…

MALICIOUS

PDF

83.8 KB Created: 2021-09-16 10:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e911d96dfe79aaed109ae6c8cad734e8 SHA-1: 34174760bf9ffc579d7a57e926a57df4d8ca6632 SHA-256: 0ef51fada2f5bacbed3945f01801463e4a43a8f2441ab35819c0d6346ab98ac3
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The presence of multiple external URIs suggests an attempt to redirect the user to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=for+android+6 PDF link annotation
    • http://allamericannursing.com/userfiles/file/napuxuresipojosove.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/86678987069.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/rukosaxopise.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/janinedufotifuxukura.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/betanutulajemovo.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/75885375666.pdfIn PDF document text
    • http://vendax.ro/files/file/76938676658.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021090522152873499.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/59591453847.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/budediga.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/budidapilez.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/17402638176.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/63187756694.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/vivok.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210903083256505.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/wawuxezafoledamij.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/milibevewugalimiv.pdfIn PDF document text
    • http://pbpharm.com/upload/files/50227148334.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/fulejavuzegigixipiwebo.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/1552578743.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109090814294437.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/23099316327.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/kosevarofexira.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_off0000e669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE669 17840 bytes
SHA-256: 8cc41a150d7defb6b46019f5f3daa7324e4d2c54b5a8d95e9f849c29b1075be9
font_01_sfnt_off0001140c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140C 9944 bytes
SHA-256: 12eeaf94d7dd713e282f253285ac2dcdab7e4df0156afc7c138946ed86c49ce8
font_02_sfnt_off00012a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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