Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb26025e65cf6c56…

MALICIOUS

PDF

69.8 KB Created: 2021-09-29 02:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f99f74875bb60b49ab883c1d34f9aadc SHA-1: de054235fb261467f00464e617df1399634ba246 SHA-256: eb26025e65cf6c56eb23a5c7977593cb79778b133fe1dd52ed023648e12020f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to malicious sites.

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://sheilahancock.net/blogfck/file/ruvirolofukarisivutovix.pdf In PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/13811633927.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/sozafadafij.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/kefupenajititojebufemi.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/24868174129.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210912161343.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d21d0ddbe---50990058033.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/29378762003.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/3540603115.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/wuwanoju.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/jimuzoxinekufibenatok.pdfIn PDF document text
    • http://splogservice.ru/content/file/rifiwo.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/73964379470.pdfIn PDF document text
    • https://petek.biz/resimler/files/lodakovotuvuzeda.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/7c9c7ac633208057d07e7e43bb08ab21/legibiw.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/6977498804.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/88021479721.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/63057071271.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/12425324773.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/retuxagon.pdfIn PDF document text
    • http://grandfiltr.com/files/file/31044598143.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/13159693785.pdfIn PDF document text
    • http://gugugroup.com/userfiles/71830424679.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/94339503512.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/60251137136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=pepi+super+stores+downloadPDF 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_off0000b05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05E 10572 bytes
SHA-256: 61e4d12cd148a990f05f85b8545df1575ca8e2c13bb1e0e20dcede08094d0a9f
font_01_sfnt_off0000c8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C4 16352 bytes
SHA-256: 952f63fc3f35012effc082797d40af2a38681f7cac03d007543e55cf0221d056