Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0bd7b48e5a2283…

MALICIOUS

PDF

69.4 KB Created: 2021-03-26 08:37:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53340545a334782edd5f4d0cac1d16c1 SHA-1: dc0aa75d4224de3432667cbbe36920409dd49be7 SHA-256: bf0bd7b48e5a2283ad235c47412b38cbd9571af0124228c36a6b5e9c5ef2c3db
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards the document's primary function being to redirect users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/strik?utm_term=a+wild+sheep+chase+dnd
    • http://fejekadiwoxobiz.getenjoyment.net/cantaloupe_island_drums.pdf
    • https://venozosuvizulul.weebly.com/uploads/1/3/0/8/130814909/c2dfc2f8.pdf
    • https://gawufuxawejax.weebly.com/uploads/1/3/1/8/131855981/4329251.pdf
    • http://lodomujimujug.mywebcommunity.org/best_business_development_job_titles.pdf
    • https://rakevuxex.weebly.com/uploads/1/3/4/0/134040666/a04ae716.pdf
    • http://wivevemeb.scienceontheweb.net/99033467828.pdf
    • http://pusewuvi.medianewsonline.com/xekezezaz.pdf
    • http://rezexepenoma.scienceontheweb.net/how_do_you_reset_a_robertshaw_thermostat.pdf
    • http://busimaderule.mywebcommunity.org/96978351492.pdf
    • http://lemafesopeposuz.mywebcommunity.org/92947160725.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/39128cb6-0d93-46b2-a396-9fcd5f9fb3a9/voxuwuvogipotejora.pdf
    • http://gajopule.myartsonline.com/birepelewinil.pdf
    • https://uploads.strikinglycdn.com/files/b05b59f3-e04b-436f-9645-defbc3cb270c/the_memory_string.pdf
    • https://s3.amazonaws.com/gavobawum/1988011525.pdf
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_fa243aa3030b49689dcd5e9e65a884f5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2b68ce44-a488-48ce-aa1c-4bfe4cc777fb/how_to_start_a_love_novel.pdf
    • https://s3.amazonaws.com/wavunot/editable_bracket_template_2015.pdf
    • https://uploads.strikinglycdn.com/files/bd3b4502-2c93-498b-853d-53aad2592b39/sharp_tv_wont_turn_on_flashing_red_light.pdf
    • https://034618a9-9b39-4f41-ad18-95bca1d1c80b.filesusr.com/ugd/48d9a1_5105ede2c716469f964ee4e5ddcbaa59.pdf?index=true
    • http://kimawawasero.onlinewebshop.net/wejumo.pdf
    • https://uploads.strikinglycdn.com/files/908849e8-1b40-460d-a150-801e0e7bbc91/matlab_loop_over_matrix_rows.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d276.bin
bf429b96e9e0ba94c95839bf8d6f471c9a58aac8f8cefcb462cd2b090ac16800		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD276 5148 bytes
font_01_sfnt_off0000e408.bin
ba4fb0855539d6bc2383902fe7c928b804d6afee87d90c525f8a151e6e708ecb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE408 11008 bytes

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