Malicious PDF — malware analysis report

Static analysis result for SHA-256 886156caf986e735…

MALICIOUS

PDF

69.0 KB Created: 2021-09-10 13:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 12468c632c07c24a39dc3caaa56ccb42 SHA-1: 994427c753fda10b4b21a9c06c3393ccdc8885eb SHA-256: 886156caf986e7359f62be9f247c803cbabc6cfd424ae7c1c9f723d0fefb3d44
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The file also contains numerous external URIs, including a link farm on disposable hosting, suggesting an attempt to direct users to malicious websites. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

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://krisoc.ru/uplcv?utm_term=how+to+connect+laptop+to+mi+tv+stick PDF link annotation
    • http://top1np.com/ckfinder/userfiles/files/jabog.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/lulorumek.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/703716180.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161355717854e5---goket.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/52003265715.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/97590714138.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/tetunose.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/41623121807.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16136601723fe4---poromego.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/wapelu.pdfIn PDF document text
    • http://bdnchem.com/upload/files/25990680597.pdfIn PDF document text
    • https://blugarden.eu/file/goboweniw.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/jamasotufinelapadatadi.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210907215826-tukutij.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/towinizogijivifirowuxokaj.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/votusupaxuv.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/60263615507.pdfIn PDF document text
    • http://stroi-sistema.ru/img/fulepipedofufodutozid.pdfIn PDF document text
    • http://sdes.in/uploads/pamenusemuwapujuji.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/vilumunitugebi.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/79799931878.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4766d45e4---tizonisivef.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/19810804340.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/pixotibuduxubomaxosapag.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_off0000b181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB181 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC993 14536 bytes
SHA-256: b4842c11f3416ab10cc793b20a12bae2552f79f926c42a739a4adacf7268ce86
font_02_sfnt_off0000edc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC4 10668 bytes
SHA-256: 3e9a8830e0be84e460e710ce929cb8a9a9cc462c84d8145b1cbb426f81476278