Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f070bea04deeff1…

MALICIOUS

PDF

77.7 KB Created: 2021-09-20 17:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e8c54e1ab6c5e1c828710ddeb4ea83a3 SHA-1: 3f68996516874a88c8f1c25a806d97080a8b8bdb SHA-256: 5f070bea04deeff152631578eb348eaedb64cd87ea835445af7c05dff3089ae4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, indicating a link farm or phishing lure. The PDF structure and embedded content suggest it is designed to redirect users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/dafibilasof.pdf In PDF document text
    • http://luligang.com/ckfinder/userfiles/files/41762772772.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/dapinefudi.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/xegodepebidizim.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/87127990738.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/jakililoguwifojafikifevu.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/38260067267.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/6079240329.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/99629709061.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/dinuditewupotugexa.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/fewaderugusaxif.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/posefumidonunawavedubu.pdfIn PDF document text
    • http://wuchem.com/upload/files/10272220076.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/50393086f958871ed2610dd4adc341b6/vulomupemariwojotup.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/vazife.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109110642495657.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/rojadetodajo.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161387cb9b4f56---9560716419.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/kewuropidiwivobikix.pdfIn PDF document text
    • http://juha.be/_files/file/87734992689.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/68958713582.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/48209240345.pdfIn PDF document text
    • http://chinazzjx.com/d/files/71876952662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=fake+time+apkPDF 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_off0000ceaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C1 17288 bytes
SHA-256: 42c4960067d750ff7df147783634fdc25d3b473a724eac540afea095fb5b72bb
font_02_sfnt_off0001138f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138F 9944 bytes
SHA-256: 324cb31eb8e79ecb53ab44783f3fd8aa2f3e07e15e6a5aeaf5fc81d6dc30a97a