Malicious PDF — malware analysis report

Static analysis result for SHA-256 9263d5a385747df1…

MALICIOUS

PDF

72.5 KB Created: 2021-03-31 03:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b9179dfaf254ab04119ff768a6fd2459 SHA-1: f180ffa640d872153796007877e9f051a711c41a SHA-256: 9263d5a385747df1c7a3722c25ae5372b614d3e2532b340f411c1fd5030a8369
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, including one pointing to a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, appears to contain metadata related to search terms, reinforcing the lure of finding educational material.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://seumenha.ru/award?keyword=barron+s+sat+math+2+book+pdf PDF link annotation
    • http://gazzsheff.xyz/bancs_tcsg8ea8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417423/normal_5fe0fca66c881.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/ieccjgj/5302414219.pdfIn PDF document text
    • http://cyberghost.store/bazaxarogeminiapr03.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/computer_programming_languages_lista0q0p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451736/normal_5ffc2e49b4a05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473656/normal_6022047e65312.pdfIn PDF document text
    • https://cdn.sqhk.co/marivefigus/XihhfaH/gopukidigu.pdfIn PDF document text
    • http://teplotronic.ru/drinkwell_pet_fountain_replacement_filter_cartridgestfi8r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392441/normal_601aec725cfae.pdfIn PDF document text
    • https://cdn.sqhk.co/salenasova/igmghgR/dual_monitor_setup_mac_mini.pdfIn PDF document text
    • http://help-lnstagramcopyrights-verify.com/wesijepasoxajonadigusxd9w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368494/normal_603d0731c4174.pdfIn PDF document text
    • http://aycotoro6.xyz/xuruvaloxuke0e9em.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8ed7ad90-0d0e-491f-9c15-1f6cd5a61d18.filesusr.com/ugd/f1a804_9d10650f7e6b404680b3314e667bc77f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a0d7d67-b028-4cef-9761-91cfb4c5cdf1/warriors_dont_cry_summary_chapter_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6db1c30-eb6a-4091-a1be-6674f304ef86/romeo_and_juliet_character_analysis_with_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9cec69a-038f-430a-b445-a2d48d88c628/amc_10_2015_b.pdfIn PDF document text
    • https://9a86171b-24d8-4f43-8717-687e75280c8f.filesusr.com/ugd/6234e8_73d6ca05f1c54431a5ee8305d970015d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/090ad658-4d56-424d-a0ec-208b9d936012/why_wont_my_wifi_extender_connect_to_the_internet.pdfIn PDF document text
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_254942b7e2b14ef29ce471eadc98ed84.pdf?index=trueIn PDF document text
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_674dda5b184a44348cc24f16ff523ad4.pdf?index=trueIn 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_off0000d855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD855 5632 bytes
SHA-256: ac8dbdafa678145f623b5c39a304fe1cf1d94704cd2afb5c97c272cfff538be6
font_01_sfnt_off0000eb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB54 14704 bytes
SHA-256: 3a56e2fe56a7dfb582d3777d74b9f3c99a586041419a9941ca5f94374c5eca10

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