Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84fc830d6987f53…

MALICIOUS

PDF

68.4 KB Created: 2021-09-26 13:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb995f58d258d727b0aad2e39bf2c20b SHA-1: 12304eceb1da2e75f94e0c645a2bacbf9dfee9b5 SHA-256: f84fc830d6987f5323775fbf41b9318b4ebe843ddf6d282ef27f78b2bed669da
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=how+to+install+firmware+on+android+phone PDF link annotation
    • http://woodlandhills.ilovepokebar.com/uploads/files/xasaji.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/25573150316.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/bapojego.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210923_67A2B69A8485AC64.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/gomizumilomisi.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/gotadaxufotepujebumobiw.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/ripibozatafagalo.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/refevikul.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jilotol.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16143ed01e63f1---nuvamufumubolujodabo.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/98805603884.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210906_145407.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/furopugigojodirido.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/58358229198.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/sopewunajitokivoxe.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/jijuwado.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/visemiwovufo.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/bipepafutam.pdfIn PDF document text
    • https://fultoys.com/userfiles/ferapuzezi.pdfIn PDF document text
    • https://ibextrail.com/editor-images/gerojewobosa.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/57754989951.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/43303988498.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/lepuvofobaxapel.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/868485925.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_off0000aef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF7 14560 bytes
SHA-256: 35c637e027a9c918d0d4fdb21ae8f7187e1d066c24a786e95a96b32f0aec24b0
font_01_sfnt_off0000d332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD332 10840 bytes
SHA-256: bbab6b19b7dfc62c7dee49f298c5aee00929c96cf8c6b550b606b798b1a1863d
font_02_sfnt_off0000ec04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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