Malicious PDF — malware analysis report

Static analysis result for SHA-256 266c77ea119ce7f9…

MALICIOUS

PDF

85.8 KB Created: 2021-09-15 06:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ab27b291cf8ff6639da2a6677371c744 SHA-1: 861e8f27aeb80cd13f87e14753ef0e81fe0ca1e0 SHA-256: 266c77ea119ce7f9a98edbfff4083540f9e9498a99bcdb7ed041b5da3406d43b
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 high likelihood of malicious intent. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to distribute links across various hosts. No scripts were extracted, but the overall structure and heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://inarchengineering.it/userfiles/files/kumogefefuloruzivoj.pdf In PDF document text
    • https://xn--49st2et51duvk.com/upload/files/84356139141.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/dugajaliwabujagoxod.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/tatosufafagavitosexikoma.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/5124248588.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161414a7b9bb37---parusuraxu.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/wuvemalolum.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/gajarupevimijirexijexeviw.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/39223573451.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/4426015204.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/04ee86d2e0b9b7e7bfda2ae474bfc50a/wesojusije.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/kujotazoko.pdfIn PDF document text
    • http://carbonelite.ru/file/pobipowib.pdfIn PDF document text
    • https://fishuntpesca.it/file/53363269536.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/61819061506.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/danibulakepibufip.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/71384835604.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/xuxifesaregumipenuj.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/lumobufezuzejol.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/tajekubobow.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/17273918794.pdfIn PDF document text
    • https://ancoraeducacion.com/images/rumorumomimetu.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/85038642148.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/notiwapebuvoxo.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/fosojudezemaledoguna.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/xagorugej.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/xulisipamodikuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=locker+codes+2k20+ps4PDF 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_off0000ea28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA28 10376 bytes
SHA-256: 0e5a158e291474f25080f62cbc05553bfdeee199cefe11b2bb6b853b8c06b867
font_01_sfnt_off000101c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C9 18676 bytes
SHA-256: 18f0a3a5d15c3cc581e85e9b7598898d01c409fd9186d16b9a6921cae59bd262
font_02_sfnt_off0001316a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1