Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e024f78e9e4e6a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 05:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: df120cb42183762dcc9d8633de76ee13 SHA-1: 920c4a1deae98fcc00ddb531ca28bfc316351015 SHA-256: 39e024f78e9e4e6a6172c80f81e89e0043fb3116e10eeb0924da3baf46311b42
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many of which point to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the overall structure and URL distribution point to a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://2222.netsociality.com/upload/files/pemabodevubo.pdf In PDF document text
    • https://szallas-karpatalja.hu/upload/sijasexeperirarid.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/50571236324.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/virilerevufapukotawilogef.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1630516138.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/pivigamotorusigiv.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/69290554899.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/22036863004.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/32317231298.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/9858296649.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/wofarojefiwowadibedof.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/mizakoxojugexenoweziwipu.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136463129330---lamoduwefisirazuv.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/86007252197.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/tosemojuvoxemovikana.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/72000100003.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/71702241109.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/78086690917.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/lumadarokaxefizomisugor.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/fatukinagabukemuful.pdfIn PDF document text
    • https://medtek.vn/storage/file/tufuraxi.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/rujujixezugexewa.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613483b99a916---39211016987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+heinle+%26+heinle+toefl+test+assistant+grammar+pdfPDF 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_off0000ce40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE652 22628 bytes
SHA-256: e898dab30de3212639b19e24e98b9af2db68ea65390712ff84386a5fc0c9a9b1
font_02_sfnt_off0001216b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216B 9520 bytes
SHA-256: fec8c45296f573a04842caab940bee463278c74d3c91d83565f23e0852fbd4e5

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