Malicious PDF — malware analysis report

Static analysis result for SHA-256 25bd6a0ca73db538…

MALICIOUS

PDF

76.8 KB Created: 2021-03-20 00:51:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5666bf00b609215e0182c6fe5a173630 SHA-1: 56d075a740f46a7e5e149ed4da510dbf6da405f3 SHA-256: 25bd6a0ca73db538ae880cfb7258eb573e4b0f974c98277baaa320e3fdc064fb
214 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=mean+variance+optimization+excel+template In PDF document text
    • http://copyrightreports.com/relationship_between_electricity_and_magnetism_to_operateci0np.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/ihnjcib/79528882238.pdfIn PDF document text
    • http://fly-drive.online/28556363199gs7wf.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/davavadowuletojozawizeponcea.pdfIn PDF document text
    • http://dadefuxafovub.22web.org/home_appraisal_template_excel.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/jgKt9gh/dojepulitowozosawabupupa.pdfIn PDF document text
    • https://cdn.sqhk.co/mibupufek/5jidhj0/bavixagovogudu.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/bhgjhrM/nike_air_jordan_1_real_vs_fake.pdfIn PDF document text
    • https://cdn.sqhk.co/futogifoku/wDiahcd/34281099936.pdfIn PDF document text
    • http://gutivenar.22web.org/tikuti.pdfIn PDF document text
    • http://techanomic.com/binary_options_strategies_bookoawat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/why_we_crave_horror_movies_response.pdfIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_ac8000c356714ffbb3cee9c0b64d80d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/arctic_silver_thermal_adhesive_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/cambridge_igcse_biology_workbook_2nd_edition_answers.pdfIn PDF document text
    • https://66f9c2bc-82a6-463d-9ccd-9c94d3d8805e.filesusr.com/ugd/b361c6_7866ef5a730a48eca0cd6429465511d8.pdf?index=trueIn PDF document text
    • http://gofirog.epizy.com/92442407511.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/jonuzujuxapufatonovuliwo.pdfIn PDF document text
    • http://maferodo.epizy.com/46160245300.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/arcsight_esm_6._9_installation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/36657462830.pdfIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_9f6197fdd23143f4a52ab33e2d6119e2.pdf?index=trueIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_4c9b58fcbba54ebda53d3dd3240281b5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuzamada/good_doctor_episodes_guide.pdfIn PDF document text
    • http://bobujosu.epizy.com/relative_clauses_exercises_and_solutions.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_off0000ee04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE04 5084 bytes
SHA-256: b522bf0df89a18fd65604532faec63d7db4e6fec7a5e308d9d8da5f9af00bd16
font_01_sfnt_off0000ff5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5C 11112 bytes
SHA-256: 2ad6a59a8042a0b96a2ba209d5f184d47cc26195eb826d0a1be0de4f49b1dd76

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