Malicious PDF — malware analysis report

Static analysis result for SHA-256 8396a3eae3a5dd61…

MALICIOUS

PDF

79.2 KB Created: 2021-05-03 13:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4a3887b2354acad43c62abefb6c4321b SHA-1: 91610ea96fe32f173ee018d1f0fa9668aeb0dc37 SHA-256: 8396a3eae3a5dd6198ebcb1cda47e33e1cd86db96267785e61f63199856e35e2
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'Epic emr system requirements' and 'wkhtmltopdf', potentially serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://soxebez.ru/strik?utm_term=epic+emr+system+requirements PDF link annotation
    • http://zeruxejobimal.mywebcommunity.org/10733984240.pdfIn PDF document text
    • https://gilibowipasumew.weebly.com/uploads/1/3/4/5/134578686/7163212.pdfIn PDF document text
    • https://dekudabor.weebly.com/uploads/1/3/4/8/134893804/satisulu-bijufusavisa.pdfIn PDF document text
    • https://cdn.sqhk.co/dodamewope/jge0Egh/brimonidine_tartrate_ophthalmic_0._2.pdfIn PDF document text
    • http://finipupote.mywebcommunity.org/definition_of_content_analysis_in_research.pdfIn PDF document text
    • http://durebemidiges.getenjoyment.net/vizomoz.pdfIn PDF document text
    • https://ralubimuxafoku.weebly.com/uploads/1/3/4/3/134373731/mitezesi_zoketu.pdfIn PDF document text
    • https://musopikulaw.weebly.com/uploads/1/3/4/8/134851971/99703e9.pdfIn PDF document text
    • https://cdn.sqhk.co/jofijoju/gchcrja/43978032622.pdfIn PDF document text
    • https://cdn.sqhk.co/tifobebe/fsjfUig/scary_glitch_camera_prank_horror_photo_editor.pdfIn PDF document text
    • https://sobolone.weebly.com/uploads/1/3/0/7/130775045/bugisujirojanu.pdfIn PDF document text
    • https://gosevitugelaw.weebly.com/uploads/1/3/4/4/134439416/kinudab.pdfIn PDF document text
    • https://pazijovipa.weebly.com/uploads/1/3/4/3/134327002/keromupase.pdfIn PDF document text
    • https://xetuvamabur.weebly.com/uploads/1/3/1/4/131409037/vuzewasu.pdfIn PDF document text
    • https://narigepafosi.weebly.com/uploads/1/3/4/4/134471788/91963284473875d.pdfIn PDF document text
    • https://cdn.sqhk.co/mowamukar/g7Qm1ja/talking_tom_cat_download_for_pc.pdfIn PDF document text
    • https://favopitovuseb.weebly.com/uploads/1/3/4/4/134455409/3988920.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dea54472-3c99-4fb2-9095-f7ef3bef36fa/zugisazaxusoxeza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41a7aaeb-629e-4986-9d43-05469486bf73/93215962985.pdfIn PDF document text
    • http://gajopule.myartsonline.com/balsamiq_cloud_export_to.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39bbff79-1ce6-404b-9783-e7182e0ebd3d/best_bread_machine_recipes_using_all_purpose_flour.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c0a0437-1e01-4f4d-8e5a-530a0fdde014/69935014087.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC00 5020 bytes
SHA-256: edd962f22dd47d87623a44c674301620d816bb4efbd18f242e3f59e21788b5f1
font_01_sfnt_off00010d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D15 10044 bytes
SHA-256: b8c8618ccaa14af262d7acfe61b7aa8b553d418406c4def5f4569861168f50df