Malicious PDF — malware analysis report

Static analysis result for SHA-256 9594c1e07e2da96a…

MALICIOUS

PDF

78.0 KB Created: 2021-10-06 04:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1d43213be53bef55f307f540ee05dad9 SHA-1: 5582a9719d3a561db974cc6a200e8ecfa7351cdd SHA-256: 9594c1e07e2da96a79ff3be65ada32d7d1ae3327c2e6a870156335bbb1eaf62f
134 Risk Score

Malware Insights

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

The sample is a PDF file containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, many of which are hosted on potentially disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • 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://petroservice-eg.com/userfiles/file/luzofakixuzapofategaz.pdf In PDF document text
    • http://gysanya.com/upload/file/211006075357287779l1zz8o38gd7x.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/najobodejoja.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/82577329181.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/46959549428.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/95059018718.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/zumibir.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/97055208890.pdfIn PDF document text
    • http://pololanna.com/user_img/files/5312288244.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/2987153001.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/bezizawomijodulekeregi.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/budame.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/wogajososoviw.pdfIn PDF document text
    • http://master-br.ru/img/file/ganuvatifefinonipowin.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/86178726851.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/demivuvafamokox.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/kujurixotazuzanolobil.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/33349295316.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1630463548.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/rudufupaxurowax.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/resosupixafalinasiwo.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/75703395060.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/31975440960.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/rejofiwaxen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=introduction+to+marxism+pdfPDF 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_off0000cbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDF 17912 bytes
SHA-256: ea6c357657a2f8e2a049331f3f5fe9f9344d7136ecba7e05cc1c6c4094a4614e
font_01_sfnt_off0000fa11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA11 10756 bytes
SHA-256: b6da9c9df9bf5f22cb16aed35e57197781a1013717abd735295fd76a3aeb339a
font_02_sfnt_off000112cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1