Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3bcf5e4f6483f8…

MALICIOUS

PDF

78.1 KB Created: 2021-09-10 08:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 253a2271b92a0324ba5e3e105d5173ab SHA-1: ec9a0e5167539c0c1bb7435c11da69654020dd8a SHA-256: 3a3bcf5e4f6483f8e2ecfc9c96063403329822a71ad8c43339c1c069f8f836b7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mariapolis.es/ckfinder/userfiles/files/petomavupuwano.pdf In PDF document text
    • http://shinies.ru/img/lib/file/82056518735.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/24509251825.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/marewamusugigawajo.pdfIn PDF document text
    • http://www.polni.si/Images/files/28423416526.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/17592476291.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/tibesip.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9fbb739fc.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/23987888204.pdfIn PDF document text
    • http://nhatnguyen.vn/media/ftp/file/pejowemomarejutu.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/32074114771.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210907031335.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/koxulegorovifewedizemi.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/tileve.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/jirivebojizajazovezu.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/13639058583.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/52475994549.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/kitopinoriwubizomawivazoj.pdfIn PDF document text
    • http://446888.top/userfiles/file/gexiwuvarobeg.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161354decb295f---37568959214.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/mojeba.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/95498105732.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/80992932989.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/janejawupusexapemidor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=josie%27s+on+a+vacation+far+away+chordsPDF 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_off0000cbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB2 10816 bytes
SHA-256: 21cd25971585bdea3e091d084af5774676c50d8ff0449c8112a5019f518d88a9
font_01_sfnt_off0000e4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C0 17740 bytes
SHA-256: f347f5b73c5fdc79fe2a33fc67ed436f1752430ef87ef0e5ba297fd31b952e32
font_02_sfnt_off000112a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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