Malicious PDF — malware analysis report

Static analysis result for SHA-256 117d30ed41ce0fca…

MALICIOUS

PDF

83.0 KB Created: 2021-09-21 03:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d5c3cd9e45fde1fb8d3b8fd459150cdb SHA-1: da00a79c851b35eae8e18994ccdd9bf96e9e8407 SHA-256: 117d30ed41ce0fca576e7444687be20f6843fc911ea1477cfc9fbaf72a6fa14a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous external URLs suggest a phishing or spam campaign aiming to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=el+lobo+estepario+hermann+hesse+pdf PDF link annotation
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/5889878509.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/24839347930.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/489dda5c934948da467fbf62bc5b26d1/polod.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/sapaxosikemokib.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/temudibamabunadozifaneli.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/43407907653.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/wejabo.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/koropitamuzomezuvizixu.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/fisafuxugadidebokugalije.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/96646565520.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109121824263680.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109082346165698.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/lekuguxisabafipuso.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/7939484587.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/33849978816.pdfIn PDF document text
    • http://falconltd.pl/cache/file/45178248723.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dee7542edf---tazebar.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/julanezeb.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/kewuluxarilulemile.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/dutawusowifazadeterexax.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/rexirirubawotem.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/49623328216.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/jugefisusakotowejofosa.pdfIn PDF document text
    • http://195exim.com/datas/files/jupubuw.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_off0000df0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0E 10888 bytes
SHA-256: 9bffa4b483fa3dab1e3f3b7b8ad4f1a57d056290c56540a16cbeed9f574bb094
font_01_sfnt_off0000f7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD5 18768 bytes
SHA-256: e72c5ecfb1a8b27c99f36ba733a64856149ec9e3ddf4bad78fe5c64ae79df128