Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4d1229489bde82…

MALICIOUS

PDF

71.3 KB Created: 2021-03-22 14:23:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2a11c2f8e4858dcbc519f9b45c4f58c SHA-1: 53c85ca0b7113fb3ae1eba20f8574282cb8de963 SHA-256: 7a4d1229489bde828a4734e526b932fa3077e91280ca117ca316636d17891668
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning and distributing malicious content. The 'PDF_SEO_LINK_FARM' heuristic indicates a large number of links, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm its malicious nature. The embedded URLs point to suspicious domains, suggesting the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=exploraciones+student+activities+manual+answers+pdf
    • https://pogizufibedisiw.weebly.com/uploads/1/3/1/6/131606284/zimevujajutona.pdf
    • https://rizibibaruf.weebly.com/uploads/1/3/5/3/135383358/zasilefima.pdf
    • https://cdn.sqhk.co/fekolisuzub/jbhejei/30th_birthday_parties_for_him.pdf
    • https://fefokivaz.weebly.com/uploads/1/3/0/7/130776727/92043cc7.pdf
    • http://idealslimitaly.site/hp_officejet_7510_wont_printjfl4s.pdf
    • https://cdn.sqhk.co/zezetemirag/EQjfjfG/vikulegirefewigumidefix.pdf
    • http://demask.space/corporals_course_fire_team_operations_answerscnuzf.pdf
    • https://lowexupunodod.weebly.com/uploads/1/3/4/8/134896298/6435529.pdf
    • https://vususutuf.weebly.com/uploads/1/3/4/6/134634118/detuvalub.pdf
    • http://menformula.xyz/casio_wave_ceptor_3054_manual1uioh.pdf
    • http://relax35.ru/when_was_samsung_galaxy_note_4_released5iv06.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/68b6a4b0-7a51-4df9-81b1-57e1ecbab157/how_to_install_urban_walls_decals.pdf
    • https://28ae28a3-27cc-4d38-be83-0de1f6925f83.filesusr.com/ugd/454016_e6282f6ea4de46cf9d6569b380bed5a0.pdf?index=true
    • https://53ee2ee6-42da-4c96-954f-60f726bc8d53.filesusr.com/ugd/de2744_7545d8984a02469f8ccf1b5c2e62bd57.pdf?index=true
    • https://76c87692-cca9-4651-be8e-de6412dad411.filesusr.com/ugd/fdad67_b77f9903417a4a999df63f89c469395c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/446e0ced-41e1-42d7-b768-b3e6c73f8507/61847581862.pdf
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_2652be22ce2b4b988ffa0f331a81e24f.pdf?index=true
    • https://0ac950e2-707a-4e47-8bf4-daface0ea9db.filesusr.com/ugd/356f11_cbe49f23c839449a9f4b393881f918dc.pdf?index=true
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_53cba7aa08ee422d9c92261aefd319a7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fdb196e4-d0f4-4fc8-b576-efbce92d2537/18124492262.pdf
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_a31852c6731d4ce59fb8a5a528ed50f0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/93cafbe7-bc73-417d-a020-eb4feadb3b08/68169043221.pdf
    • https://uploads.strikinglycdn.com/files/64841c3d-f54c-47c5-87ee-623e1f76e91e/gajapipejexa.pdf
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_568f1f2a1ba7462d8490b7907543da15.pdf?index=true
    • https://a3720f92-bdaa-4449-a3ff-14f36884d2d5.filesusr.com/ugd/afadc3_e3d6dafe72554361869e5494b11b77f0.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7e6.bin
b58e1e3994ca23b8bf2b5f1e46c86c93931264230f0ece61bbbc541667efa005		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E6 5480 bytes
font_01_sfnt_off0000ea8c.bin
ceee88226f6ba619da7b71225cc590fdd6e8e352a9349a700a35f641573b50a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8C 10204 bytes

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