Malicious PDF — malware analysis report

Static analysis result for SHA-256 892ddf7f40861551…

MALICIOUS

PDF

96.0 KB Created: 2021-10-08 03:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9e87e8a72313d789b023fce9fdc3e25a SHA-1: b10dfe7246bfd79efafd497e33ea4d40fb0a0d15 SHA-256: 892ddf7f40861551486c413240dad55aee3d4f1ad2ed0f11412bf3ce49aef923
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs, many pointing to PDF files on potentially disposable domains, suggests a link farm or phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9672

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://alertsecurity.in/ckfinder/userfiles/files/fuponoloduraviwamozamifuj.pdf In PDF document text
    • http://biirbeh.mn/images/content/file/matejodimamizijiwuka.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210927165646.pdfIn PDF document text
    • https://mindtrainingsystems.com/userfiles/file/94774281603.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/norebuxuro.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/miveviziredewoturipopib.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/wosinukafazarejazaraxotot.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/rilajos.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/17454062944.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/35917884400.pdfIn PDF document text
    • http://drtamerturan.com/file/67472303686.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/64608130026.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/xigidosupaxirejumuxom.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/mewajizurewup.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/32253675533.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/63427829848.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/tovovezolamagejef.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/88462887776.pdfIn PDF document text
    • https://2acontractor.it/images/file/43938823432.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c8fc643e4---dolijukusikuguzipe.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/bujudeginuzivefiw.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/fbe031cce6c448e9f561e9b1fbfc8c30/pemalase.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/37954459025.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/xiloluxivakut.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/foneposopokirifala.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/wamasibaponafofoxupum.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/63666103070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=oxidation+number+of+hydrogen+in+h2so4PDF 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://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_off0001078d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9F 22292 bytes
SHA-256: 6164b84a544293f2ddeb73f57966cae91f22a28c5618483be5e869f828ed2d5f
font_02_sfnt_off00015934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15934 11436 bytes
SHA-256: 45dfc246f415c4bbffd41b3fc2dc2d0ea88bdd5aab5fdf95583baa40f1846753