Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e13fc848cb13f2…

MALICIOUS

PDF

65.8 KB Created: 2020-11-17 12:20:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 18738521303715b229f240e3dd922462 SHA-1: 22217265da4dff67d3c67e9df9f5a25d7ef41359 SHA-256: 99e13fc848cb13f291280322aed12efbeaf0d8c1790821f62bc8c3a25a49b6fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://trafffi.ru/123?utm_term=wood+county+health+department+coronavirus PDF link annotation
    • https://rimenedefogifu.weebly.com/uploads/1/3/4/4/134466040/dukexonuxufon.pdfIn PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/xerelenolekex.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/64722d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452398/normal_5f9f02222b81c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403120/normal_5f931fef0bb9d.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/nipomomuka_gisotufeje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376379/normal_5fa31fefa8b11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377931/normal_5f91923c55888.pdfIn PDF document text
    • https://gutakabumediru.weebly.com/uploads/1/3/4/4/134492877/ca5a7e0f4e895.pdfIn PDF document text
    • https://wonigebegi.weebly.com/uploads/1/3/1/6/131606731/3285ee88ea5.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/4973c0ed-ea4d-4714-a424-aa89e6387b79/61437664469.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/razor_scooter_model_e150_battery.pdfIn PDF document text
    • https://s3.amazonaws.com/muvunekagok/plants_vs_zombies_app_download_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c33d477-55a0-4149-9bb7-8c4b6f6ed510/ultimate_alphabet_answers.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43D 5488 bytes
SHA-256: d1b4161b13303172372b5559e090aef81122be0d79a2e3822e9a3abbe48834fe
font_01_sfnt_off0000d6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D1 10428 bytes
SHA-256: 87d7dc4eb5e7ea09f88d0e430b57d2c2c2186a176c15f099be295ed2cc47785e