Malicious PDF — malware analysis report

Static analysis result for SHA-256 e87594fa6cd4a8a4…

MALICIOUS

PDF

84.4 KB Created: 2021-09-12 01:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d454302625e293fcd545b562109043a6 SHA-1: 6e5909ed7ad9855ac9af783a48195c433c76b639 SHA-256: e87594fa6cd4a8a4f66cc22de5991b25358dc1460a6da6ea72b1af49eb4ee17e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to malicious websites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://inwebjor.ru/uplcv?utm_term=download+aplikasi+dumpster PDF link annotation
    • https://viettincapital.vn/upload/files/79628660617.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/eb2e6af967d618acb0606bf7ed39bb65/24867159022.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/85797499563.pdfIn PDF document text
    • http://asqcert.net/files/files/gebigogav.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/59248428176.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/dofanawad.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/xewulenisekemobekelatefox.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/sorudefiropiw.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/vusarepufowifitajuzura.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/71f865596c6b42b9fc0f8b8899368338/83820671380.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/rudagesosekokupepem.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/12570962590.pdfIn PDF document text
    • https://badrivishal.com/media/74448866627.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/56330016592.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210912055734.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/92913936688.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/vejeviwefuri.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/nedebitu.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/sojetufojomedukamanowetop.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/62443884373.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/25556752378.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/xububokazod.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_off0000e0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C3 19104 bytes
SHA-256: 781bf528426a2c5eaaeb5b73a5ea4424889a8181258037bccaf3dbd6f8f9a454
font_01_sfnt_off000112c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C6 10832 bytes
SHA-256: 88735082fdba82908aa18a953cd66b4830d4b60b239daf8abb9894b02fda2b0c
font_02_sfnt_off00012bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1