Malicious PDF — malware analysis report

Static analysis result for SHA-256 c00cdcbcec6b0039…

MALICIOUS

PDF

79.0 KB Created: 2021-06-11 00:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 131fdb71e2dce1d462fbecc18800f90b SHA-1: c8eda7ed3fb195918db4b76a112a16b1e609ff5b SHA-256: c00cdcbcec6b00395d3268fac1ac9ce03d54ae7f31e5a6390d23f3609fee9073
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9997

Heuristics 4

  • 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://irlanc.ru/pbw?utm_term=if+you+like+calvin+and+hobbes PDF link annotation
    • https://sopebanodi.weebly.com/uploads/1/3/4/0/134017095/6475514.pdfIn PDF document text
    • https://wemedasexokava.weebly.com/uploads/1/3/4/5/134512162/9967109.pdfIn PDF document text
    • https://damapedev.weebly.com/uploads/1/3/4/5/134576203/gekotuxuzin.pdfIn PDF document text
    • https://relotozaku.weebly.com/uploads/1/3/4/2/134266658/xomakuxod-zadimekopin-dobiwiti-pizalazavilut.pdfIn PDF document text
    • https://mejojesakawevud.weebly.com/uploads/1/3/1/4/131438193/7843969.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/19748dae-9893-4df8-b787-7de69ae81a1b/34532186167.pdfIn PDF document text
    • http://natizasex.pbworks.com/f/46578182021.pdfIn PDF document text
    • http://fokurid.pbworks.com/f/dividing_polynomials_by_monomials_worksheet_with_answers.pdfIn PDF document text
    • http://duvetemeb.pbworks.com/w/file/fetch/144971487/an_abc_of_english_literature_download.pdfIn PDF document text
    • http://gabumur.pbworks.com/w/file/fetch/144527961/77527559670.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4519cf3d-683a-446d-8c4f-33362fb10528/59484989328.pdfIn PDF document text
    • http://zilebunod.pbworks.com/f/a_court_of_mist_and_fury_series_in_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee731511-6990-452b-b0d2-f24b4499b124/70992993028.pdfIn PDF document text
    • http://fadoposapat.pbworks.com/w/file/fetch/144446586/methode_de_batterie_dante_agostini_volume_1.pdfIn PDF document text
    • http://jowugaredite.pbworks.com/f/xafok.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/f/jusunoni.pdfIn PDF document text
    • http://rimikupababo.pbworks.com/f/can_ielts_test_be_cancelled.pdfIn PDF document text
    • http://kalunagepigi.pbworks.com/f/titan_minecraft_launcher_not_loading.pdfIn PDF document text
    • http://lopofemusun.pbworks.com/f/jenedenosagijotudadide.pdfIn PDF document text
    • http://tarogifere.pbworks.com/f/chittagong_pola_noakhali_maiya_full_movie_hd.pdfIn PDF document text
    • http://bofamawetodo.pbworks.com/f/daderademubax.pdfIn PDF document text
    • http://gakuwibed.pbworks.com/f/lfs_s1_unlocker_download.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_off0000f667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF667 5316 bytes
SHA-256: 4c21bc805081979c039188fcacdbbb24d4b91a5f08e7751ca5badb98f081dec7
font_01_sfnt_off0001088b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088B 11116 bytes
SHA-256: cbb38aa5a46684e7979a899273cf2be4ec5beedd66fea78a9b3c26eaaa21598b

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