Malicious PDF — malware analysis report

Static analysis result for SHA-256 833d0ffc3ad29cf1…

MALICIOUS

PDF

78.9 KB Created: 2021-03-20 14:12:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12840c93573b39243d9446693e99f12f SHA-1: 9677f6843afcb98b286268bc8b9d8c5d7068d0ba SHA-256: 833d0ffc3ad29cf16d349f66f2f3ba01347fed1641d0a8e3b8f5d0bca0c431ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO abuse. While no scripts were directly extracted, the PDF structure and external URLs suggest it's designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=how+to+open+liftmaster+security+remote
    • https://static.s123-cdn-static.com/uploads/4475196/normal_5fdd347e4ce0d.pdf
    • https://cdn.sqhk.co/xomakonezema/hgV5IF7/forward_assault_remix_online.pdf
    • http://kinorio5.xyz/bowurusidopitulukegajelideao5.pdf
    • https://cdn.sqhk.co/jokutevek/nwZ5m7W/zepowuwitifefawaderaxo.pdf
    • https://cdn-cms.f-static.net/uploads/4383334/normal_6051e99521236.pdf
    • http://lnstagram-help-businesss.com/30272485682j0bv0.pdf
    • https://cdn.sqhk.co/wafavalufa/sgdtSYf/fupimedozoro.pdf
    • https://static.s123-cdn-static.com/uploads/4413693/normal_5ffd300c07375.pdf
    • https://cdn-cms.f-static.net/uploads/4382620/normal_5fd8303d44823.pdf
    • https://cdn.sqhk.co/nepozenilu/XnJnAif/xajunumafikedit.pdf
    • https://cdn-cms.f-static.net/uploads/4498842/normal_60493e632c272.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/8e4d96de-96c6-4e8a-854e-ace6f8a55a70/how_many_peter_pan_books_are_there.pdf
    • https://uploads.strikinglycdn.com/files/99a5cabc-9bbc-4153-91f3-2c70129f5b4e/84727344368.pdf
    • https://uploads.strikinglycdn.com/files/9b244aa8-9388-4a26-96cd-63a3d906d03f/tipos_de_funciones_de_lenguaje_c.pdf
    • https://uploads.strikinglycdn.com/files/a3bb92a8-6979-4be5-97e3-5477df7fd2d8/high_standard_double_nine_serial_numbers.pdf
    • https://5e3b32e6-a537-4a58-a531-ef303a468713.filesusr.com/ugd/120874_67ef9cdaff21409a8dfe952d115da0af.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9c255af5-9639-4925-80ce-b67c9fef0078/easy_writer_7th_edition_barnes_and_noble.pdf
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_f23e5d583e2341399912f130586ae43d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7b9df09a-97e4-4477-b0a8-a19e2aa6c61e/reading_comprehension_worksheets_year_5.pdf
    • https://uploads.strikinglycdn.com/files/040c9d3d-5eec-4108-947b-604df8e5061a/touch_of_class_catalog_promo_code.pdf
    • https://uploads.strikinglycdn.com/files/b51e4187-cb49-41e1-8a08-56d56831cc82/wevefigupapasogobuxab.pdf
    • https://uploads.strikinglycdn.com/files/e57e6db9-f7b1-4be0-ae85-45373f1cd173/what_order_to_watch_marvel_movies_before_avengers_endgame.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e561.bin
a693254fd9a93b9090ec2bd2c9d74f1c5c7b3fdcb0ccdeccee80c423eb2d60fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE561 5196 bytes
font_01_sfnt_off0000f6ff.bin
950ab9a0afd2f7a29694ea45729a2675bfca069faf602fbb771e30a6b8738ab5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FF 11420 bytes
font_02_sfnt_off00011db1.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB1 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.