Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d398d1cd19bf53…

MALICIOUS

PDF

87.2 KB Created: 2021-09-17 18:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3130be5470ae414c1757fa9121607e43 SHA-1: 0d51fc2e3b4e62f87cd485eea66b66768fed507b SHA-256: 25d398d1cd19bf53cb059503b1c1435f2a74998b82c0449abc4370f621b248de
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document is designed to trick users into installing a fake browser update or extension. While no scripts were directly extracted, the presence of numerous external URIs, some pointing to potentially disposable domains, supports the phishing and malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://allytemp.ru/uplcv?utm_term=pixels+full+movie+123movies
    • https://atlastoursntravels.com/userfiles/file/tedes.pdf
    • https://dhesient.com/media/36311731541.pdf
    • http://erainbowrealty.com/userfiles/file/godeluxenuxonarupox.pdf
    • http://tweddlefoto.com/files_contenidos/upload/files/fojiviwewukiguzibuf.pdf
    • https://maritime-models.com/userfiles/file/24835673347.pdf
    • https://biholka.cz/uploades/userfiles/file/jadedepifunuziv.pdf
    • http://energo-winstal.pl/userfiles/file/43776649348.pdf
    • https://lesartsdansmonjardin.com/userfiles/file/20210907165556.pdf
    • http://hflbdq.com/uploads/file/080223063131.pdf
    • http://touristclub.in/userfiles/file/92254599919.pdf
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/jimadi.pdf
    • https://adeptos.clevercloud.pt/images/items/files/54520356349.pdf
    • http://www.rify.us/cms-uploads/files/veredavewojulug.pdf
    • http://www.dr.schure.net/ckfinder/userfiles/files/muvovudazidujelenosujukog.pdf
    • http://kingkady.com/uploadfile/files/fajufox.pdf
    • http://www.psoealora.es/ckfinder/userfiles/files/35194186607.pdf
    • http://aleshashop.net/uploaded_files/userfiles/files/48188485779.pdf
    • http://brukikostka.pl/uploads/page/file/65962612350.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5b2fd0996---vurorufiwizo.pdf
    • http://perlawarmii.pl/userfiles/file/setovarazepumom.pdf
    • http://brava-ekb.ru/userfiles/file/lazudabemilegarogo.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a44faf6ea---mekivuwer.pdf
    • http://s250801404.onlinehome.fr/img/uploaded/file/76020857438.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAC 16792 bytes
font_01_sfnt_off000106be.bin
842e22628a4593700f4290467427825874f1290762cbdde237d2970f40369ccc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106BE 18304 bytes
font_02_sfnt_off000136d5.bin
73167ef993945d7e3373caf11578c590775f5150ef23bd82d143d89d59b3dee4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136D5 10524 bytes

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