Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd1d97aa6fc71f1…

MALICIOUS

PDF

75.5 KB Created: 2021-04-11 06:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 175cb1d911c354a8d02ba22b0ad49e93 SHA-1: 1c0c2155ee1c07896576328774603ef63162aeed SHA-256: cbd1d97aa6fc71f1c1af7e082ec3caf862990a1a515390bec5c109255f592370
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 0.9998

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://golowaki.ru/strik?utm_term=ezra+pound+cantos+analysis PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475209/normal_5ff756519b00f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474998/normal_602c713800758.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403120/normal_600e7604ad943.pdfIn PDF document text
    • https://rapowude.weebly.com/uploads/1/3/1/4/131454581/fukizobijov-sukomazezafuva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412161/normal_606e9e465cae5.pdfIn PDF document text
    • http://vonoxafaku.scienceontheweb.net/cours_pratique_d_arboriculture_fruitire.pdfIn PDF document text
    • https://mefupawex.weebly.com/uploads/1/3/4/3/134317460/b92db2b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474722/normal_602e630f928d7.pdfIn PDF document text
    • http://bimovixexena.scienceontheweb.net/longman_preparation_course_toefl_paper_test.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495849/normal_5fcd73a9377ee.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/f2dcf623-daec-45a8-a90d-b75727b515ea/2019_ford_mustang_gt_coupe_rwd_0-60.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3440a964-eaa9-4202-b4bd-7dc12b5abdf5/linear_programming_and_its_applications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/285c5843-57d5-42fd-8611-a2fd2644c28f/descargar_curso_de_guitarra_acustica_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca9c3157-8c38-46d0-97d5-08c30ba7180a/nobapoxokesazapanewime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3139a314-a9e6-4665-951b-a394c1878d35/solufigusibogemo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4baa99f-a355-48d8-8725-c65548057c95/8027310009.pdfIn PDF document text
    • http://rexefobixavater.myartsonline.com/bubulazasifukatena.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b1cadfe-917d-4efa-bddc-5a173c361fe7/5943069861.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_off0000dece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECE 4940 bytes
SHA-256: 14dd973996db712a770b24da92b6f0135ea7bcc85c32223b860f9aa056276f54
font_01_sfnt_off0000efa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA2 10272 bytes
SHA-256: 06fdc03461e86ab705f1e721dc52ef8ebcc65ea101f2724c55ad5a9ddaf7a36f
font_02_sfnt_off000112f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F2 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378