Malicious PDF — malware analysis report

Static analysis result for SHA-256 d130ec964c92697d…

MALICIOUS

PDF

75.2 KB Created: 2021-06-01 08:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 31f29cef5fdeb63d0e73e1e19ec668cf SHA-1: 78c9f4e244131e912788b443ca5e06a7b1b3ecd3 SHA-256: d130ec964c92697d9ba467be19d45dec6813a61c731e63ec8188a6d15203d225
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs are indicative of an attempt to redirect users to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://pelibifir.ru/123?utm_term=double+comparative+worksheet PDF link annotation
    • https://lobobofu.weebly.com/uploads/1/3/4/6/134680821/4971065.pdfIn PDF document text
    • https://juxewuvolexi.weebly.com/uploads/1/3/4/1/134109000/rotogubuxovu.pdfIn PDF document text
    • https://febujularezot.weebly.com/uploads/1/3/0/8/130813651/sifun.pdfIn PDF document text
    • https://mibigadoguful.weebly.com/uploads/1/3/4/7/134759919/a62cf7.pdfIn PDF document text
    • https://temisufe.weebly.com/uploads/1/3/5/3/135384001/17e4c6193e.pdfIn PDF document text
    • https://juxatameserog.weebly.com/uploads/1/3/0/9/130969062/8201664.pdfIn PDF document text
    • https://visuripaxu.weebly.com/uploads/1/3/4/7/134711721/5815958.pdfIn PDF document text
    • https://bevazemirif.weebly.com/uploads/1/3/4/8/134873662/3964338.pdfIn PDF document text
    • https://zusonuxegaza.weebly.com/uploads/1/3/1/4/131437774/0826d5c727fea.pdfIn PDF document text
    • https://vosaxoro.weebly.com/uploads/1/3/4/4/134469305/tawiwesonakaw.pdfIn PDF document text
    • https://rimokukesezawuk.weebly.com/uploads/1/3/1/4/131437069/6220784.pdfIn PDF document text
    • https://zukedobawalot.weebly.com/uploads/1/3/4/5/134526307/kesozepizomofu-dilerofiwis.pdfIn PDF document text
    • https://zuvaxufar.weebly.com/uploads/1/3/5/9/135993026/742487.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mapijakemifo.pbworks.com/w/file/fetch/144447093/que_es_contabilidad_fiscal_segun_autores.pdfIn PDF document text
    • http://godekazonigi.pbworks.com/w/file/fetch/144435291/15385220102.pdfIn PDF document text
    • http://wixugigir.pbworks.com/f/fumaleginonomusikumom.pdfIn PDF document text
    • http://funinupun.pbworks.com/w/file/fetch/144425649/63145056543.pdfIn PDF document text
    • http://vimadutukad.pbworks.com/w/file/fetch/144444093/yo_persigo_una_forma_ruben_dario.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/w/file/fetch/144427449/how_to_make_gelatin_sheets_from_powder.pdfIn PDF document text
    • http://kiletejude.pbworks.com/f/zapiwo.pdfIn PDF document text
    • http://mikabipi.pbworks.com/w/file/fetch/144437130/30_day_challenge_enlightenment.pdfIn PDF document text
    • http://wuranosa.pbworks.com/f/how_to_consolidate_data_from_multiple_workbooks_in_excel_using_vba.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/w/file/fetch/144442854/lusosija.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_off0000e997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE997 5528 bytes
SHA-256: 8062672c709322ad81c6b67c65a4173ad2c1b62bdcfbd7a84b7b25cbee7ad169
font_01_sfnt_off0000fc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4C 10296 bytes
SHA-256: 58797881cc9fb07d539f078eb5fcdcfbdc416efe81e3af80820b5a2295bfd216