Malicious PDF — malware analysis report

Static analysis result for SHA-256 2491b5499a415370…

MALICIOUS

PDF

77.1 KB Created: 2021-09-17 18:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 234f40d767152c4bd603605357853657 SHA-1: 207cc06eede998073e0c3f88653d8949bed2e866 SHA-256: 2491b5499a4153700ead235000835a6e22af44f3193e93c42ea60282ac3b3a28
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external URLs, many of which are hosted on suspicious domains, suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://limberhurstgallery.com/imageuploads/file/koneberuretibozigila.pdf In PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/66414269188.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/nitenitafon.pdfIn PDF document text
    • http://canadianrockies.info/files/file/66140425443.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/45311365420.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/xibadazomovelifalevab.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/rajepunefupujige.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/48344911707.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/97164319803.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/33833852986.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/mujakewota.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/ledel.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/jujekatusorewuxelazura.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/wuzifij.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/zoramekukidoporawe.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/buxufopigaxujegen.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/xizaziwetikurufibubapo.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/lemomoremofifutipogus.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/59107610239.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/xojiniwikiwebasumaje.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/puropomej.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/65718485071.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/gufanuboson.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/fokudemisisuluzulim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=root+mi+tv+stickPDF 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_off0000c31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC31F 10048 bytes
SHA-256: 04097fb768929c88c23fcb8adce2fdea5b90c31dc25b621a3d5ad8614802883d
font_01_sfnt_off0000d989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD989 19944 bytes
SHA-256: 4726a55de5f0ac120e7bab6b2316d33ac461212ef56c96a7bd25516d8b50549f
font_02_sfnt_off00010d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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