Malicious PDF — malware analysis report

Static analysis result for SHA-256 db9fb2e016875eb2…

MALICIOUS

PDF

70.7 KB Created: 2020-11-20 23:05:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b0b26d45ec35a07616359823ac67dff6 SHA-1: b2708e8ebd491858cd05ad3e65154c11dc072b6c SHA-256: db9fb2e016875eb26337045d65e23ff1d21d1a8348fff4e2daa4cb21163a99a5
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 pointing to seemingly unrelated documents, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffnew.ru/123?utm_term=live+nation+coupons+2020 PDF link annotation
    • https://tigizojotajubum.weebly.com/uploads/1/3/4/4/134489046/b8462ae.pdfIn PDF document text
    • https://fizolapojola.weebly.com/uploads/1/3/1/3/131383549/9686020.pdfIn PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/fb747d4f3aa.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/9faa3676-3f84-4ddf-b3c7-7fe118042bc6/thinkgeek_job_openings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c19e002-b437-4ed3-9546-2020026c4d65/fnaf_sister_location_unblocked_games_66.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3754b2e5-e4a0-44ff-b42b-8d7b6bd004fd/destiny_2_override_frequency_descent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01d96811-5280-4647-9f28-3c14e43773ca/a_cesta_da_dona_maricota_sequencia_didatica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17b88266-0f27-48f6-9d91-48bb696e79d8/wot_server_down.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3906e06e-ef91-449f-b577-e77e957fffe5/55628518137.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cfee8d7-d533-49e7-ae18-372440c842c2/jcpenney_sewing_machine_model_6945_m.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/90549597013.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC60 5072 bytes
SHA-256: 185ba707c60eac280171f8989e16ebd0928f74b6bda40b7ec2eaf46076b4d610
font_01_sfnt_off0000ddbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBD 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off0000e920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE920 10868 bytes
SHA-256: 39b2ec38f44c2c6f57c1750ad24b4f9b2370a8f558d81093f34cff74d9f974fd

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