Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ba0d4db2124d1f…

MALICIOUS

PDF

71.2 KB Created: 2021-09-17 04:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7e6a7a17afa05f2e855ba0edad7ebf89 SHA-1: 92a713e7f0fdf4ece13dd1cdb1415917e1a49f7b SHA-256: 77ba0d4db2124d1f34293faa3dff47d8d301dbf65fd58c76a6ccb8edfda6c284
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs pointing to disposable domains, suggesting a link farm designed to distribute malware or conduct phishing. The presence of external URIs and the overall structure indicate an attempt to redirect the user to malicious content, likely for credential harvesting or further payload delivery.

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://philabc.ru/uplcv?utm_term=download+gta+san+andreas+for+apk PDF link annotation
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/tuwarolafepelof.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/35612783573.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/80565051051.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/logudelilanutisidabojodu.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/98000548774.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/86357903059.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/27954174360.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/desevumomuluwetawaleb.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161391aae0011f---fufepowurewa.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/toporinurafowerikajojelux.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/zugabinidifabijajexebaxe.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/wetalatag.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/72913487763.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/miruzemotajovolezopoxig.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/romobezosopufej.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16138e8486a599---masowodupakunipanogera.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/likabijusiwel.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/66174484139.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/puxudopazu.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/tekaz.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/fetixepudimezili.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/fadirofelavitowedimami.pdfIn PDF document text
    • https://fond.ru/userfiles/file/69615866273.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/benenegagosepulinezupiw.pdfIn PDF document text
    • http://vanhacollection.com/images/files/25871977534.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_off0000b4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFB 16060 bytes
SHA-256: 4ef3b277d872c754acbe9c4f140f40f322e0d45959b8e9d8c1ed598dcfaee23a
font_02_sfnt_off0000f65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65F 10760 bytes
SHA-256: f243cf52ed703762f715bd70eac1a7df7724e29d6a0788aedd75fc640019ca0d

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