Malicious PDF — malware analysis report

Static analysis result for SHA-256 25eabf94e1c9bc98…

MALICIOUS

PDF

71.6 KB Created: 2021-09-20 10:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6cd7610ee10c5974770f236d65c71f5a SHA-1: 9f3d1414a48c11c081cf77b1bd8d499d625d7a6f SHA-256: 25eabf94e1c9bc982aaf2a7cf76ab499a22e90cdbd0bcb32cf323332f099d8d2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a heuristic firing indicates it's a link farm on disposable hosting, with numerous URLs pointing to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://allytemp.ru/uplcv?utm_term=class+7+cbse+science+book+pdf PDF link annotation
    • https://zahrek.com/userfiles/file/78874550703.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/noxakamumotulovipiwibepe.pdfIn PDF document text
    • http://canvangdientu.com/images/file/gosujazapaziveba.pdfIn PDF document text
    • http://space-edge.com/upload/files/fodisiw.pdfIn PDF document text
    • https://jobtiara.com/files/files/wilepakarajugivuw.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/9733181883.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/tumazenulokiboti.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/letadefonopes.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/gipopikutenage.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/sirijolexuvetutolama.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/tirosiborixesuwirogamub.pdfIn PDF document text
    • https://argumentua.com/i/file/misiva.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16136a9eb6a441---51165363725.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/gonabavuzejoxekolojiji.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/pidisujorit.pdfIn PDF document text
    • http://storemisr.com/uploads/files/duked.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/68379734439.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/3634975187.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/rifizavunuwow.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109110317442454.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109151303494359.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/vapagidoruzu.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/buzijojep.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_off0000b8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D8 15660 bytes
SHA-256: f0e78f28646d9d817799ee832233a2814686bd4451cdc3b6529ec57e46e6b86c
font_02_sfnt_off0000f81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81E 10728 bytes
SHA-256: 3b4082e97e26971e14bb748933dd9cc8a3b4dd6c8fb32f25764b9b9b266f3420

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