Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e592590a7be882…

MALICIOUS

PDF

97.7 KB Created: 2021-06-08 09:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3158a487ad1fe9807d1f930875dcd675 SHA-1: 49719a7a761fff06e2ce79f0a4e2a6604bc24859 SHA-256: 28e592590a7be882af544a21a14e51fca949289f3fb081f6a0bf5509866544b1
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 0.9992

Heuristics 5

  • 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 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://laborke.ru/pbw?utm_term=newcomen+steam+engine+facts PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379369/normal_5ff509b87215f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412568/normal_60b87ac58942e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489588/normal_5ff236c28dd54.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4464869/normal_60b10c11ca727.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369331/normal_60bb07d056c0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482216/normal_5fc93a3532558.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bopelijexuf.pbworks.com/f/el_cristianismo_primitivo.pdfIn PDF document text
    • http://lexibitite.pbworks.com/f/15465366618.pdfIn PDF document text
    • http://paderukut.pbworks.com/f/how_to_know_how_many_molecules_are_in_a_compound.pdfIn PDF document text
    • http://lurilimid.pbworks.com/w/file/fetch/144796479/iphone_6s_plus_schematic_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de0b7f8e-bdfe-48ae-9f13-52c45f4a2a1a/samsung_galaxy_tab_4_sm-t230_firmware_download.pdfIn PDF document text
    • http://ximusutoj.pbworks.com/w/file/fetch/144826923/how_to_build_breakfast_nook.pdfIn PDF document text
    • http://vulazojab.pbworks.com/w/file/fetch/144629847/gta_sa_ios_apk_obb_lite.pdfIn PDF document text
    • http://mujusevo.pbworks.com/w/file/fetch/144480198/productos_de_la_primera_sesin_del_consejo_tcnico_escolar_2020.pdfIn PDF document text
    • http://pijipusap.pbworks.com/f/multiplying_and_dividing_rational_expressions_answer_key_kuta_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bcd870e-3279-4f25-9493-1d5bd5e9cb10/geometry_dash_2.111_apk_hack_todo_desbloqueado_mediafre.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f42414a1-bc35-44fd-aef4-75867ece0b5a/4836979160.pdfIn PDF document text
    • http://garigor.pbworks.com/w/file/fetch/144427437/tajiximewazuxoladeniwiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/992220d8-97a5-497a-992f-66e9bf17f799/all_physics_formulas_of_class_9_and_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca0febff-74c3-422e-b02c-d5a1c1164140/vetefewenaborobenoxizem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73138287-d3c3-48cc-b905-e253782efb59/baldurs_gate_2_ee_portrait_pack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/706a6b6a-aa6b-4942-a0f7-13721858130c/ruger_lcp_2_380_drum_magazine.pdfIn PDF document text
    • http://rubepikonot.pbworks.com/f/26055343934.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e56fa602-eece-4b53-9b4f-4b724dd9b54b/vatusanajurofoba.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_off00014186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14186 5132 bytes
SHA-256: d7c4bff6db3a1bf4c9da840b0bf9348516f552b8eba4f1c15d2f51bb0b615474
font_01_sfnt_off0001530f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1530F 10940 bytes
SHA-256: b6b2ff594f02030faff9d8ad7b9aa5c0bcbb370d4bdfb2b235c31b53a7c77517