Malicious PDF — malware analysis report

Static analysis result for SHA-256 26405ec0c551c5a0…

MALICIOUS

PDF

87.4 KB Created: 2021-03-04 18:54:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: d26d3435245de5ae32ebfa21ba896ce7 SHA-1: 6a36abff7fa631fd285196aa662a79963b30dcb4 SHA-256: 26405ec0c551c5a0256178a8f155281af95ba060d67ae3b968e65ec11149ea7d
186 Risk Score

Malware Insights

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

This PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/award?keyword=nikon+f5+vs+f100 PDF link annotation
    • https://cdn.sqhk.co/timafewa/hdjgheC/missing_persons_reports_massachusetts_2020.pdfIn PDF document text
    • http://kyrgyztours.com/69380314229up0fx.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/logihha/dragon_hills_mod_apk_hack_download.pdfIn PDF document text
    • http://vetebozo.mypressonline.com/m_audio_keystation_pro_88_driver_windows_10.pdfIn PDF document text
    • http://pawomodom.medianewsonline.com/gopinan.pdfIn PDF document text
    • http://bubixuwegopoxer.22web.org/isaimini_movies_2019_tamil.pdfIn PDF document text
    • http://on24-system.club/auto_clicker_ahkbvtgu.pdfIn PDF document text
    • https://webakutukulufu.weebly.com/uploads/1/3/2/6/132683024/29884c5ba83b10.pdfIn PDF document text
    • http://navazufufedi.iblogger.org/puxonugudosuwaniroxewotag.pdfIn PDF document text
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/217434d.pdfIn PDF document text
    • http://lalabomujulimof.mywebcommunity.org/how_to_do_crossfit_burpees.pdfIn PDF document text
    • http://nicepics.xyz/9896962659aviav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ranuvukeguzekiz.epizy.com/berlitz_spanish_phrase_book_and_dictionary.pdfIn PDF document text
    • http://beralopijabeziz.rf.gd/60539492136.pdfIn PDF document text
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_010ab5befc014b198af78df91950f166.pdf?index=trueIn PDF document text
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_20115acb5d0148bb8a5e6d97a0712e07.pdf?index=trueIn PDF document text
    • https://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_05128e686a5145bd9c8ddaa1155d03db.pdf?index=trueIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_ff745afae39142fb96fe5b09f3f4c9d9.pdf?index=trueIn PDF document text
    • https://9334512a-4df1-45dc-8804-f0fa1d9e2a3d.filesusr.com/ugd/9466eb_529e405dc7194e9ba35d3483c10b4e26.pdf?index=trueIn 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_off00011b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2B 4832 bytes
SHA-256: ebea11692da1e558970cd8f71e91fd733d82a7dfb5493b107534c18f567c01ce
font_01_sfnt_off00012bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD8 10824 bytes
SHA-256: 35ee90e10cfc5a60130831969fe1f1d3d956d2f6e866b635894fea23e9bc7c4a

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