Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ba809f052d6af0…

MALICIOUS

PDF

80.4 KB Created: 2021-04-05 13:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: dfdc657f444c15c92ef9239187483bf2 SHA-1: 536a21f8a0618e5b8d2c2d72f1525334474738bf SHA-256: b5ba809f052d6af09093c6f95a5997e01a629f62bbb9d4a2381df2c7880fb8c4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, a technique commonly used to distribute phishing content or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent. While the document body is heavily obfuscated, the presence of numerous links, including one pointing to 'baarspo.ru', suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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://baarspo.ru/123?utm_term=chunkz+malayalam+movie++masswap PDF link annotation
    • http://gopadaxin.mywebcommunity.org/boteva.pdfIn PDF document text
    • http://kurametugugu.mygamesonline.org/inorganic_compounds_book.pdfIn PDF document text
    • http://vipimuxatomefi.medianewsonline.com/31955211193.pdfIn PDF document text
    • http://fejavodexata.getenjoyment.net/build_my_life_lyrics_and_chords.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/gEhjtkA/george_strait_songs_love_without_end.pdfIn PDF document text
    • https://cdn.sqhk.co/wufotubi/jbdSOig/monster_hunter_world_iceborne_ps4_digital_code.pdfIn PDF document text
    • https://cdn.sqhk.co/guranotup/Yhifhii/mental_maths_worksheets_for_kindergarten.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/dQicTif/27811604678.pdfIn PDF document text
    • https://cdn.sqhk.co/lewonuvaxu/jMriejj/wileti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_856e1955e0414056b2c86a4e7c1be59e.pdf?index=trueIn PDF document text
    • https://52b03d57-94e3-497b-b2ee-5a576b8f136c.filesusr.com/ugd/67ae49_866c22a8453049f980a1a4eca5626d4b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a45891f7-5513-43ef-a88d-12edba74677b/escuela_psicologica_psicoanalisis.pdfIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_ac554fccca8e429399ca1d8bdf54ee46.pdf?index=trueIn PDF document text
    • https://b6e49935-6d58-4bde-831f-6e0b746776d3.filesusr.com/ugd/7d321f_6eece923139d4a66b2735a24a3878100.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1defff8-0638-44be-ba23-9e513a4908d4/witcher_3_game_guide_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee7eff79-c846-4af8-a231-663892ab49a7/rinugerix.pdfIn PDF document text
    • http://fojosotum.myartsonline.com/you_were_always_on_my_mind_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25a3d574-d915-4698-bd96-aff98797fd0a/55487961846.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41aca3e9-60e0-496d-a2a5-3cb77376c229/black_and_decker_lids_off_automatic_jar_opener_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c531c626-3f1d-4460-83e0-dcd8acc78812/86777226398.pdfIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_e6727156ccda4209ae1c74709589e23f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f404c97d-a9c2-4e2d-9f37-708e74594cfc/principles_of_real_estate_1_quizlet.pdfIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_c0baf58f6d634966aa06d9c557a3396b.pdf?index=trueIn PDF document text
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_9ee369be1c1c4e07a5b1ac05b62a7d6e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd0bfede-78a2-4f57-89a1-4b7df49e9d83/walmart_covid_vaccine.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_off0000fa5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5D 5236 bytes
SHA-256: 8cf4c7133b431172d558227e4b846692187a07bf66460381636c648ddc6eebbf
font_01_sfnt_off00010c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C24 11712 bytes
SHA-256: fe1fc165ec812dd48c4f2f14510421908420946baa340e5ff0af8c9eeeebaf36