Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0350bab8e55356…

MALICIOUS

PDF

83.8 KB Created: 2021-09-13 16:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c7db4197eb36fad798139e92d0d05745 SHA-1: 40853681a8627a223bb47591924856f9807b69ef SHA-256: ae0350bab8e55356539314421caf631de6792f776c1957ec674a832e10bb80dd
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one that appears to be a download lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload. The presence of embedded JS suggests an attempt to exploit PDF vulnerabilities or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=install+smart+iptv+on+firestick PDF link annotation
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/besomeratujira.pdfIn PDF document text
    • https://lorus.rs/files/budamuxuludulizuraxo.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161338b860c0f9---17586179722.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/87682660240.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/65121915864.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/gofavezedit.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/12659718845.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/64446370636.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/35369592938.pdfIn PDF document text
    • http://domuran.pl/files/file/gugulolufiladubokuxamukun.pdfIn PDF document text
    • https://doitoutdoorz.com/file/YttpfriNgqh7HEve.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/89271049904.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/17673993815.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-11/20210911081732703553.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/50912811057.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/37738755914.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/97299746969.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/35067088085.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/wuvamasufawilifenelarome.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/banusuzavi.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/21329577900.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/80956289897.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/nojuzolud.pdfIn PDF document text
    • http://baove24h.info/upload/files/kogapifomo.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_off0000e107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE107 18452 bytes
SHA-256: 8b49e58293eaf67ffe73d2fc453bf2e1a528fac728c54e18e8b166d0903325fd
font_01_sfnt_off00011089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11089 10752 bytes
SHA-256: 3ea025f57d383b8b8e4bce5eca417a2eca0b0ffa78dfef8e322d61054b1aba70
font_02_sfnt_off00012944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1