Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fbdd96534d0b548…

MALICIOUS

PDF

69.3 KB Created: 2021-09-18 20:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 61158843eb0c9fab886408ca6b75066d SHA-1: 07e1413ef4ecf135528708e875cda4d4b8c092bb SHA-256: 5fbdd96534d0b5489268b9d75caec0c55c86137e64fbc81223b0f863a0408331
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://coretry.ru/uplcv?utm_term=snake+and+ladder+game+download+for+android PDF link annotation
    • http://savitapiti.org/ckfinder/userfiles/files/93497134552.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091021023544200.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/xuwewomi.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109022110585264.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/95006677629.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/60e303f5cf2310242b2227865b3a165a/lokifimuduzalekufubipubis.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/50516314761.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/nonenazunitaragapaxuse.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/fudevopusugaxe.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/zidamag.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/37308111798.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/banatidufu.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/kituwemodegaxokowesozaxud.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/batowop.pdfIn PDF document text
    • https://netlandschool.cl/files/70417074774.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/xanudezaze.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/75667286605.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8f2d72128b25916916b1c2c909f5151c/dobokejojira.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/69929390962.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/34493133573.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/fikavalaxixujono.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/sevezimufefezexivaku.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/kujofoferix.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_off0000b149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB149 10684 bytes
SHA-256: 12d67659e56958f0e0b1e00c5ebf0051444df9992b819e9e9b5e15ae96d52840
font_01_sfnt_off0000c994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC994 14976 bytes
SHA-256: f69d9112aebbc57b4f7f1c307d7c0d538b7c428490810287767dcda7d8486696
font_02_sfnt_off0000ef76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1