Malicious PDF — malware analysis report

Static analysis result for SHA-256 027e7518921b31ec…

MALICIOUS

PDF

85.7 KB Created: 2021-09-10 00:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aebde27b2fd03e8ce5be29fa389622bf SHA-1: 0489e5e9dcaa1a562fb04b3090388a8046977317 SHA-256: 027e7518921b31ec4db9ca28b8d639edb3fc2c858c143a2551dfbd7b9fb51f72
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many on disposable domains and utilizing UTM parameters, strongly suggests a phishing or link-farming attack pattern. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cructi.ru/uplcv?utm_term=movie+online+2021 PDF link annotation
    • http://paliukenas.lt/i/File/mewugevomikopebizi.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/76689240192.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/11747486076.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/14443248515.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/76335352097.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/jotewaratuj.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/48340481042.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/rosowurugodowapekebogudeg.pdfIn PDF document text
    • https://digireg.sk/upload/47507939704.pdfIn PDF document text
    • http://camonetinternational.com/files/file/jariwusixatotisas.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613269d55d63e---24866414858.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/rapavufaloduxagakenatigon.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/kexemexuxamagelalavob.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/woluzu.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/gizojebexujozixaxapotuwe.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/68099948253.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/gonegakagisorab.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16132edf07c6b7---73366573284.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613829a016ded---92364842472.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/45458774443.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/lesomodeperugoketozikowuw.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/mozozuzori.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/vaxugupidizarid.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/xuzuxigawevinovukapifimu.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/73252483885.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_off0000ea44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10256 18980 bytes
SHA-256: 5c6951e81eda38814191c6bb118b1a431dcf2cca91221705a2d4d539ece4429e
font_02_sfnt_off0001338b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338B 9928 bytes
SHA-256: 0663b5c881e20522f608f99208d123d7e2bd7011e911d4507da12358f7662658