Malicious PDF — malware analysis report

Static analysis result for SHA-256 3597e25239d61e9d…

MALICIOUS

PDF

107.5 KB Created: 2021-03-29 06:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d81a16e4ad14a6cb3310f8e1c7fb0173 SHA-1: 001066dd0ad60443937a81ccbb29b399a1fa570d SHA-256: 3597e25239d61e9dfaf14a022f4b47a8fb03594a13fbd8db76460fcfbabe2fce
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it's part of a link farm designed to manipulate search engine results. It also contains an embedded URL pointing to 'midufefew.ru', which is flagged as unknown reputation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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://midufefew.ru/award?keyword=che+guevara+history+in+telugu+pdf PDF link annotation
    • http://snail-case.store/954206869701unrn.pdfIn PDF document text
    • http://summerita.fun/tapigovepedoxulugizeuxfg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/552d4b76-8174-4a75-ae4a-bbd4204fca38/how_do_you_say_super_ugly_in_french.pdfIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_8acb0f13ec9045108205fc2791508bfc.pdf?index=trueIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_29fbc827aa4d40ac9b102d8c0b981643.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/99078159-d801-4690-95ba-40d4974d3ade/yaar_nuri_ztrk_siyasi_hayat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96b6d9df-6b92-481f-86d8-2f0d784c568d/curso_de_ingls_avanzado_descargar.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/koletukafusujopob.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/achieves_by_conforming_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/wasuposekasapa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d06bd5ed-b076-4132-9185-b80f88d82936/xbox_one_controller_charging_station_gamestop.pdfIn PDF document text
    • https://e42ce0b3-f376-4cb5-9abe-507fdbb9570c.filesusr.com/ugd/603474_fe7306a5c6bc4c7896f07ef8f25b6e53.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfb7a403-c691-4acb-a300-d30851327884/xogivolegugefed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b258fb3-e66b-4a50-88c1-fe88c519d3db/hush_little_baby_dont_say_a_word_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4becc357-700b-49cd-bc64-7cec62fb87e2/xunem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59447fb6-013e-4a41-a7a6-8fac96977e0d/verbos_regulares_en_ingles_ejercicios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8697ef95-5379-4c3b-b750-fb47d2909d23/xogexerejelituzogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed63c51b-9e17-4c7e-a06c-c491e168b21f/rothfuss_book_3_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8cc1aca-ce98-4aaf-b71e-e42d6dd10cd0/sexiest_man_alive_2018_youtube_video_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/187e24ad-a12c-4181-9568-f308520ba139/59339804711.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f24803d2-979c-47fa-aee8-8c60770d490e/sinefuvutetewatot.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_off0001026c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026C 5372 bytes
SHA-256: f5f577cfe5e5413baa92c154713e64749d35395d05867b9c65e1fe5536f75a8d
font_01_sfnt_off000114b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B6 53492 bytes
SHA-256: feec3e6280044af12c960a55a2c38352317e6b1250a1706085bbb16234e07c4d
font_02_sfnt_off0001783e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1783E 11512 bytes
SHA-256: 4bcc78efb0107c21522a3e6c5b2e4cac441173be68624bc5d508de7765a98402