Malicious PDF — malware analysis report

Static analysis result for SHA-256 519d8305693cea67…

MALICIOUS

PDF

84.4 KB Created: 2021-05-16 07:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ff47b94482141e72a5509177647a2a7c SHA-1: 21e85d2195a9267bf6fbd1cbfa3283b598ef50ce SHA-256: 519d8305693cea67150c8eff07bc981b698f697d87edc28405a7480f7db2f57b
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The embedded document body, though partially corrupted, contains a lure related to 'red lobster nutrition low sodium' and references wkhtmltopdf, indicating it was likely generated programmatically to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://vilenefex.ru/strik?utm_term=red+lobster+nutrition+low+sodium PDF link annotation
    • http://shoop-fe.ru/bittersweet_sarah_ockler366rv.pdfIn PDF document text
    • https://gimeboxevamovuv.weebly.com/uploads/1/3/4/4/134494840/lomagomiliw_sezususoxe_zisevex_sibixi.pdfIn PDF document text
    • http://d-youtube.com/crossword_clue_heaven_sent7l5yc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498702/normal_5fc71e4b78511.pdfIn PDF document text
    • http://reduslim-italiaoficial.site/kukonutalufitb23pr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453326/normal_6032cb1ea61ec.pdfIn PDF document text
    • http://oneplusonemain.xyz/notas_de_canciones_tristes_en_pianoy5e01.pdfIn PDF document text
    • https://disadoxamegipu.weebly.com/uploads/1/3/4/5/134527150/00cf53d37.pdfIn PDF document text
    • https://miriziwu.weebly.com/uploads/1/3/0/7/130774981/vutug_minesale.pdfIn PDF document text
    • https://repawuwo.weebly.com/uploads/1/3/5/3/135313919/76fdca591.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503390/normal_5fc9dd0201f48.pdfIn PDF document text
    • http://baltika-trans.com/ms_project_2016_download_32_bit_with_crack59to4.pdfIn PDF document text
    • http://swiss-gear.shop/amd_ryzen_3600g_performanceunxuk.pdfIn PDF document text
    • http://chambrely.xyz/how_to_set_time_limits_on_kindle_firepksbs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/96795416-a15b-4749-aa1b-4872ec537fc9/banupave.pdfIn PDF document text
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_32bb2d6a2f074c2d85baa59b2019db75.pdf?index=trueIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_b7a673ff0b2a4f0dbcf637ee5daae4eb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8c34a56-bd3d-4c3c-83dc-b9cb6e5b8b9a/star_trek_next_generation_cast_season_1_episode_23.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10129 4884 bytes
SHA-256: 85816bddc9c0669a4c66e0919c5da74ff4d6e8635a6c67f95bdaf94e55d904e3
font_01_sfnt_off000111b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B9 10688 bytes
SHA-256: 991fb89ba3b8ee7375d00ef49736d5e8c7ede7e05979c2a4971ad58cc3d26a34
font_02_sfnt_off00013642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13642 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333