Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c588ef1c8d9103…

MALICIOUS

PDF

94.0 KB Created: 2021-09-11 02:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 380902d2b465b892e0d1bb32a4e045f3 SHA-1: 6d6a8ddfe50454b31977da83a062e3dbdc41770a SHA-256: f0c588ef1c8d9103958ab0d045156bb452edf4e202f837738617ab823b940589
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious PDF files on various domains, suggesting a link farm or redirection mechanism. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating a pattern of disposable hosting for link aggregation. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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 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 http://topenglish.sk/app/webroot/gallery/files/nolozililuzud.pdf In PDF document text
    • https://hyundainhapkhau.vn/upload/files/palabopakaxeg.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/gasafelakiwokelu.pdfIn PDF document text
    • https://websbag.com/uploads/files/67885243589.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/waxapikavuxeruwitapejo.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/voxadetegos.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/majipobabevuditi.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/vomuzebiwima.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/xonalanuvoguz.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/vebozigedidopega.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/c75a072fe6cbcf21ae03027515fe68c9/ripafizajadugobubateri.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210904204706.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/pururovimodulovewe.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/83988431135.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/34479347295.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/47984906176.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/tesesuxuzatazopimilawene.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/75683570320.pdfIn PDF document text
    • https://epiphanych.com/images/file/bazutupe.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210905224940.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/54099288408.pdfIn PDF document text
    • http://enricobarraco.com/files/dobijokivo.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130e61511dc7---pijoginuxisilusop.pdfIn PDF document text
    • http://sapthagireesyathra.com/userfiles/file/61770239468.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/mipimabomiteton.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=30+free+instagram+likesPDF 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_off000107c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD6 19496 bytes
SHA-256: 1b5b634007b9a7682b28130c1d352c07d188b9129a1d62988be8c7ee841d8025
font_02_sfnt_off000151be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151BE 10728 bytes
SHA-256: e2c7df48ff30f1f57b27f15143cc3e4bed4a292d89b508d529c9903beb8568d5