Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed2bc31b104d5e9…

MALICIOUS

PDF

101.0 KB Created: 2021-06-07 07:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8efb9eadb689396714d86f9b0b01e5ad SHA-1: 6b2b09edb2445d3b184a87bcbabdc1ea4968be68 SHA-256: 6ed2bc31b104d5e98e427334a7a9f60965ea4bbca7373cf47a4ad604b2410ef4
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by multiple heuristics, including ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a large number of external links, particularly those pointing to SEO-related content, suggests a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

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://laborke.ru/pbw?utm_term=xfinity+channel+lineup+denver+colorado
    • https://cdn-cms.f-static.net/uploads/4495043/normal_6031ae004e50a.pdf
    • https://cdn-cms.f-static.net/uploads/4469365/normal_60593ee1a5e0f.pdf
    • https://cdn-cms.f-static.net/uploads/4368956/normal_6048256f0bdcc.pdf
    • https://cdn-cms.f-static.net/uploads/4369638/normal_604ed17d5684c.pdf
    • https://gifaxefapi.weebly.com/uploads/1/3/4/5/134598377/fidedatejakadixap.pdf
    • https://static.s123-cdn-static.com/uploads/4457573/normal_5ffdb24e8910a.pdf
    • https://xofenozupe.weebly.com/uploads/1/3/4/5/134500057/134a490395863.pdf
    • https://ledifufopore.weebly.com/uploads/1/3/4/5/134524185/1807690.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/614f8c02-cb60-4ddd-95ef-d20ac792a5de/qual_raiz_quadrada_324.pdf
    • https://uploads.strikinglycdn.com/files/c0402d00-2a87-418e-b5e2-c75e81ad612b/60245991299.pdf
    • https://uploads.strikinglycdn.com/files/53e5926a-5bb8-43ad-bc88-5df5b94edd89/22516129617.pdf
    • https://uploads.strikinglycdn.com/files/431eaacb-75f7-4beb-8ea0-b525acee1563/larusidelujog.pdf
    • https://uploads.strikinglycdn.com/files/c7b761ac-9c99-4963-a3e6-35ad0c34321d/how_do_i_speed_up_my_ez_go_gas_golf_cart.pdf
    • https://uploads.strikinglycdn.com/files/7505bb8a-acd3-48bb-b75b-e8772399bce6/65325068951.pdf
    • http://kesowununak.pbworks.com/w/file/fetch/144761373/267072563.pdf
    • https://uploads.strikinglycdn.com/files/64c803ee-0c37-4b5d-93e2-542952bd8771/emperor_jones_chapter_wise_summary.pdf
    • https://uploads.strikinglycdn.com/files/9a680355-aaf1-4aac-8b7b-e4a84db6fb9e/amazing_grace_my_chains_are_gone_pentatonix_chords.pdf
    • https://uploads.strikinglycdn.com/files/785478ec-bb3a-4266-8434-f3240c35fcd4/29194259299.pdf
    • https://uploads.strikinglycdn.com/files/159c6001-7da5-411e-8b1a-a403747670a2/83685782767.pdf
    • https://uploads.strikinglycdn.com/files/b8da58e9-dd65-4557-b64c-e871a70d0a27/zoom_g1xon_blues_patch.pdf
    • https://uploads.strikinglycdn.com/files/e72c6457-86d3-4310-9014-216ab308ce4f/have_not_received_child_support_payment.pdf
    • https://uploads.strikinglycdn.com/files/b739b35f-b4aa-4864-af3b-ceaf46534e3c/59526441551.pdf
    • http://natizasex.pbworks.com/f/download_geometry_dash_full_version_for_pc.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_off00014a2e.bin
27e6c0f960ac5d76a5d147145e7316f808abac2d2aa049aa1f0688d791e85672		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A2E 5204 bytes
font_01_sfnt_off00015bf2.bin
4da5b27011a186741d768f765d32833531eb909b60f952f6adc4aaa144ca8ac1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15BF2 13108 bytes

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