Malicious PDF — malware analysis report

Static analysis result for SHA-256 47c711b12b05c67a…

MALICIOUS

PDF

72.0 KB Created: 2021-09-19 05:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f9964ca4e76c67c079d0907810b0354a SHA-1: aea42abeb3bacabc75e243f09d17a9efb277938a SHA-256: 47c711b12b05c67a2c8d7eccb323ce6d26f346e67c6d5504ca40d9f593016965
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for initiating the redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crysiq.ru/uplcv?utm_term=save+pdf+as+unsecured PDF link annotation
    • http://koppeika.ru/userfiles/file/lirose.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/48989349469.pdfIn PDF document text
    • http://ojazzdance.fr/userfiles/file/81324061001.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/84286802953.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/girugibanamadawiseki.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/23913732014.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/vebunekokenipepoxama.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/gixofabizibakagub.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/15/jazixupolenawaf.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/12730757615.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/52574212340.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/mexata.pdfIn PDF document text
    • https://afayl.com/userfiles/file/velegevup.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/a1c41ed5401d92f80e24b8cda68ec350/jiwup.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/tevidubatero.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/71836440296.pdfIn PDF document text
    • http://charivne.info/images/file/33493031928.pdfIn PDF document text
    • http://chanassociation.org/uploads/file/81809927364.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/82383815982.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/lamureda.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/25743186172.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/161379ef5bc4c7---wepofimiroka.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_off0000bad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD0 10500 bytes
SHA-256: 838034c0a0cce65797e24ad0db0689a916a47ba7cfe1eafd390fc3e4158faa7c
font_01_sfnt_off0000d2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CC 15776 bytes
SHA-256: 9cb43d53c1fb73af26d80548c496d484c8d900aa13313847cdc2c52de73fe043
font_02_sfnt_off0000fb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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