Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a26d6d000531227…

MALICIOUS

PDF

84.5 KB Created: 2021-09-23 09:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0106ce74a51e56fa645266bd0ddf2761 SHA-1: 7359a2ed007e8494dded142f90106fd5338daf1e SHA-256: 9a26d6d0005312270674df78bf33737ba167dba084968540f388b53e6e6a06f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, suggesting the document's primary purpose is to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://kompassztuki.pl/Image/files/zameloviliwitil.pdf In PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/b5f3d34fc39b18d8edaee7cc02578345/28987793248.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/vogakiru.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/40482234043.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16140380df1658---36546080875.pdfIn PDF document text
    • http://budka39.ru/files/kanoderavefevenegafip.pdfIn PDF document text
    • http://gaudi.tw/upload/file/wadesuvuwasamoxekulo.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/36871098625.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/zelup.pdfIn PDF document text
    • https://ms01bet.net/contents/files/41822939207.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/23364257533.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/75648052607.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/xewivogimupejisega.pdfIn PDF document text
    • http://erictex.com/ufiles/files/17436017912.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/fb11ab203345fab6a20f4f1df65622dc.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/dosoge.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/xuzezonewetijazikimu.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/silafupexewita.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/12795470477.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/vezoditagaju.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/xizogatu.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/xemaban.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/poravakurefir.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/zafekiliwenogofiganalas.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/xepukupusufedakizoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=free+running+android+gamePDF link annotation
    • https://easyown.ddproperty.com/datas/files/najinivofuvibufo.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://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_off0000e7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCF 17812 bytes
SHA-256: f8a825041eba738153e963acfde88c81682f5f9bba025d535a6dabd4e9f28faa
font_02_sfnt_off00012d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D96 10356 bytes
SHA-256: 44520064f6de1339ad95df5a8e91b8d45250dea47184ac0e1563c2dd61650039