Malicious PDF — malware analysis report

Static analysis result for SHA-256 97485ac64bf268fd…

MALICIOUS

PDF

88.0 KB Created: 2021-09-20 13:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 71ba80c42bb8f01e3ff60d4cc2a0dad0 SHA-1: 2c61d4a5d25efb047623a350bf72e04da819e3ca SHA-256: 97485ac64bf268fd08659b583dc7e020ca9402f6b2ae6bff197f31a188ac3992
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains heuristics indicating it is a link farm and uses urgency lures, suggesting a phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://autopsrus.com/ckfinder/userfiles/files/dufasosokibolovi.pdf In PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/kepesuj.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/toxadegifuxegodaza.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/bezulunaragakidobekono.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/busatodef.pdfIn PDF document text
    • http://pvvc.cz/files/97212980130.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/13360049651.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/89540707836.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/tovugujiteroxunemavepa.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/gipixiwerinisisisipinen.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/10967734625.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/61548577176.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcaa50c261---sumerorizitur.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/65017725467.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210914080916.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/50510774497.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/nikejuvefinulotibaxapa.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/37449998038.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/purivevipasumudulezolixe.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/63844493935.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/56324618735.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210920_8516BEF9CEE6D1AC.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/73143090817.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161448117d7622---2027119192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=c%2B%2B+questions+and+answers+pdf+free+downloadPDF link annotation
    • https://mediaget.com/userfiles/files/mabuja.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_off0000ef33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF33 10856 bytes
SHA-256: 546cc68d002d84bffa03735cf8965a3492ec9bf524a4cac8e8059fde7f1486a3
font_01_sfnt_off00010846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10846 19156 bytes
SHA-256: 98f1e6a7a7dcc751eef752b2f2723d813b609221fda4621ad1ef354987abd517
font_02_sfnt_off00013a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1