Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e552d3e2827a50…

MALICIOUS

PDF

80.6 KB Created: 2021-05-30 12:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 59d9f68142f2d740a9f5d8ddbed0da3e SHA-1: 4c5add37ddb35dab4472fb806ef8d7f36c35a9d5 SHA-256: b8e552d3e2827a503332b5082bd09461b8ee69575eabbe6449f13e909c2baadf
186 Risk Score

Malware Insights

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

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 0.9993

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://nipisod.ru/123?utm_term=flakiness+index+test+lab+report+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464732/normal_5fe58ee2e0f92.pdfIn PDF document text
    • https://lusezatakobav.weebly.com/uploads/1/3/4/3/134352635/7968916.pdfIn PDF document text
    • https://gozisali.weebly.com/uploads/1/3/4/6/134670052/jomedaluzuseveduga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382004/normal_602badfe07ebf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450625/normal_6032c63b7b211.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388157/normal_6064c2a7f2c9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406771/normal_5fdc5a644e261.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379498/normal_60356ff81a71f.pdfIn PDF document text
    • https://bakasilamor.weebly.com/uploads/1/3/1/4/131407315/bisusejudana.pdfIn PDF document text
    • https://xafafiseroferop.weebly.com/uploads/1/3/4/5/134525648/fomos-kejowetidegof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480899/normal_5fd95c435323f.pdfIn PDF document text
    • https://zanonolupurezo.weebly.com/uploads/1/3/3/9/133997165/tezobemola.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415065/normal_603eec71f22cb.pdfIn PDF document text
    • https://muwubuzegutan.weebly.com/uploads/1/3/4/6/134649477/dulejibepiwik-fipolutibopel.pdfIn PDF document text
    • https://mekasirizi.weebly.com/uploads/1/3/5/3/135325166/822180f87eeedf4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393639/normal_5fcd3d9ec8719.pdfIn PDF document text
    • https://delazodudiz.weebly.com/uploads/1/3/4/5/134591817/jeluvezafix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467287/normal_604f6ee3abbff.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/5789483f-9028-4e4d-8fb7-6432b0af9b10/gubujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bd9e4dd-f20f-4531-be21-fac07d8cb5a6/are_sports_illustrated_magazines_valuable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bd80379-8a39-41c9-a120-9fe69bf7820f/10949685639.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f8a5b0e-ff90-4f05-9857-63d9e0d7b4c9/disemitibilunileke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/638ec5d6-d0e7-4f3f-b8b2-4fe02f478324/2013_hyundai_genesis_transmission_replacement_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d055b5da-b5ad-4526-b253-b4357933282d/12720658940.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_off0000fbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB2 5264 bytes
SHA-256: 330006af2160c769082d9b520c3f313ed51b945ba3d0171487358c177ed19676
font_01_sfnt_off00010da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA2 11516 bytes
SHA-256: 2ff769b384d77b554602c6794dad13264508cef41a2fd69107d1e70b7c77efd0