Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e2910868fe6e04b…

MALICIOUS

PDF

98.5 KB Created: 2021-09-23 08:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a5f23e3c9fcc3cf51ef2b61f2f876e4d SHA-1: d520df3cd6f9d10d4d2d05c7916f24a6c0a870b4 SHA-256: 5e2910868fe6e04b827d1b7334359d0336c1cea362d48a6b71d19ab4637eb0f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, suggesting it functions as a link farm designed to redirect users to potentially harmful sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a malicious intent to distribute content or phish users through a network of disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://coretry.ru/uplcv?utm_term=gta+san+andreas+gratuit+android PDF link annotation
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/584e6601f43c6afd2258487aa5458a41/galupagowetova.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/zorirufevitap.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109051655585423.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/wapobew.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/86301129167.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/16425860286.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/61387b5a2eb5c.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/20495776914.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613912c1da24e---doziletufazofaveg.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/41447621433.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/libuxijowubunukame.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/lovifakobodopof.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/97383987978.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/kitex.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82455592750.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/zukugogo.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/lomozavobajogak.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/nususugaderufu.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/81271879696.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/walamadugasobavenexok.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_05_17_08_59_5554.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/pimimexejemiger.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/vazerukatanowi.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/88113994801.pdfIn PDF document text
    • http://business-baltic.com/myfiles/dok/9697162506.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_off00011beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000133fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133FD 18432 bytes
SHA-256: e0c913cda26e5f620e4931fd54f2da654c1e781f52c9a8a56ec173a9e0148413
font_02_sfnt_off000163b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163B9 10516 bytes
SHA-256: e7a9e262e1be665c4b5a7355f64fe965e1aa6e570529b1d59cb88b00f3bf1c52