Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a340e12d034aefe…

MALICIOUS

PDF

67.5 KB Created: 2020-12-11 03:36:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 1f241df71c2dc1f0f4e420a1d262cbe4 SHA-1: d1ce8a55d5946e73e6efc714eaa9c1f7c93d1005 SHA-256: 4a340e12d034aefe97c1eb9d7e6d53ebe0edcf74ea3c119e0cfc7762bbcc1b1d
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'bug report hypixel' and the authoring application 'wkhtmltopdf', indicating a potential lure to disguise the malicious intent. The presence of numerous external URIs and the link farm heuristic strongly suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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.
  • 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://traffset.ru/aws?utm_term=bug+report+hypixel PDF link annotation
    • https://wobelafesuta.weebly.com/uploads/1/3/4/7/134767333/puvagodet-womewo-galuzoxa-wekifotub.pdfIn PDF document text
    • https://sopopubepomexak.weebly.com/uploads/1/3/4/2/134265445/sijapawaniweziwax.pdfIn PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/1035527.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374857/normal_5fb5816f046ea.pdfIn PDF document text
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/009c284f327.pdfIn PDF document text
    • https://nebowepef.weebly.com/uploads/1/3/4/4/134483035/dudofud.pdfIn PDF document text
    • https://terurudib.weebly.com/uploads/1/3/4/3/134381327/7591922.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/519db637-78bb-43b7-8ce4-37b91d2f9b51/sifib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08d36f62-c1cb-4b23-8db3-3ff3d8f160b4/dutenalexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbdfedf4-09b7-46af-9f4d-79be0f2f3bdc/7_day_cruise_packing_checklist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e962d70c-8320-4ee3-a353-2e7c12822882/voxap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baf22a61-f83d-4acb-90f1-bb9c4edffc57/20736992437.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/220e1c89-ff89-4771-a7ac-dc8969b798e8/dadd_conference_2020.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://scripts.sil.org/OFLIn 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_off0000b7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B1 4912 bytes
SHA-256: 8bd04f0af15de787547eee3b95c65fe2196dddfeaa19ac885b5dfd2d767b6cd6
font_01_sfnt_off0000c87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87A 10280 bytes
SHA-256: 870eb8400fd9705878abc13941752202beb33e02e38979429ddb3a7212313497
font_02_sfnt_off0000ebf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF5 16208 bytes
SHA-256: fe139538347d724e6b27dab22ead91fbb1eb3470a850438049392072e7f85921

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