Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7222e7bf743bcb…

MALICIOUS

PDF

68.4 KB Created: 2021-09-30 22:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0ac52d29320ba50cd2519b0ace12b2ff SHA-1: fa0c6632b24ff5fe23ecd7c0cc54cfa68f195cfe SHA-256: cf7222e7bf743bcbc6bde0b2bcd8980377eb05c9cdc8f26d61759794f6755597
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via the embedded URLs. No scripts were extracted, but the PDF structure and heuristics point to exploitation of PDF vulnerabilities or social engineering to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=tai+telegram+apk PDF link annotation
    • http://lianbang123.com/uploads/files/202109051346004147.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/kasodixelexuxomixoxu.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/minojabos.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/buvig.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/88730636225.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131b0d776a1c---saxuzajujaxed.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/69571563702.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/10550007545.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/30616704169.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/gegaxazodilowupoloteb.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/tebiw.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16134cdc173ff7---27302867042.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/43620385815.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/47409506597.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/22286440027.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/kaxupipira.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210909_86E4765618EEC0B5.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/ruxixegi.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/terisifawewo.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/83945122659.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/basafinizadusal.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_off0000abbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABBE 15944 bytes
SHA-256: 76c164393c6ca957af305b62eee5a1f77378f62cb692658669c4809f285cd70d
font_01_sfnt_off0000d3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 10256 bytes
SHA-256: ecb932618e89ca9f580e02fe05d259f4eb6ac4b219d5feffea17364cd22a2e73

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