Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd7f1ddcd11b4e57…

MALICIOUS

PDF

79.5 KB Created: 2021-09-15 23:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c9ac1e3f278783289b8d3aaf64e1acc5 SHA-1: f814286c1a12f36f77b60bab7cf57b35e4b319dd SHA-256: dd7f1ddcd11b4e57d9712f414402c95efb9bfca6ae7aec1d463de82be043aad4
142 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the true destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/11754463274.pdf In PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/linikokivuter.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/9530197999.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/35821344358.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/devibuki.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/95479269429.pdfIn PDF document text
    • http://generoussecurity.com/uploads/xamutos.pdfIn PDF document text
    • https://sadex.pl/fck/file/64082319600.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/1399ca531282ea3d73c2436976a4d0a4/12050267563.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/butizu.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/mubakef.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/faxipib.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fde13474a1---18604743646.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/2780267956.pdfIn PDF document text
    • https://grouptm2.com/contents/files/17991180979.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/wimudonigafimip.pdfIn PDF document text
    • https://aaaxxion.info/images/file/96518395578.pdfIn PDF document text
    • http://dsagco.com/Upload/file/norenapazaxakobegamap.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/57684396976.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/soputisalisotegid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=before+i+go+to+sleep+movie+free+downloadPDF link annotation
    • 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_off0000d3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB5 16512 bytes
SHA-256: 33a99b54829593b89c7892cb8a7501cbe1fbb999e0978b5adf22caeac5a86ca4
font_02_sfnt_off00011673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11673 11044 bytes
SHA-256: a8b36baf90529df6e959769a4d5bd82377ef1081009238341d52d04613eb953e

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