Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ef78c4c75fdb4e…

MALICIOUS

PDF

88.8 KB Created: 2021-03-17 06:09:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ba54a107455da29b7d077233cbf3ceb1 SHA-1: 150e4f85b412762c06577038c4e8fc2d080e8ff6 SHA-256: 97ef78c4c75fdb4ebabd020445792655443eee4548adac9f21a5be82a2bac409
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xezojetit.ru/wix?keyword=flint+river+council+scout+shop PDF link annotation
    • https://cdn.sqhk.co/mudifuto/W2qhfqt/gafijoduxebol.pdfIn PDF document text
    • http://wefilevazobakeb.mypressonline.com/plan_de_negocios_sencillo_plantilla.pdfIn PDF document text
    • https://cdn.sqhk.co/gobefuvumi/nGdJupk/bugeziwixet.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/10738913436.pdfIn PDF document text
    • https://cdn.sqhk.co/feduvefas/jdzjaQG/racing_underground_apk.pdfIn PDF document text
    • http://mekomob.getenjoyment.net/osaka_mrt_map.pdfIn PDF document text
    • https://cdn.sqhk.co/gabazumad/ChtihSF/friend_finder_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/AhczjhM/classwork_or_class_work.pdfIn PDF document text
    • http://lotobajigufar.mywebcommunity.org/pizidisunuwiravisawidevi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gamelaluwer.myartsonline.com/succeed_in_cambridge_cae_10_practice_tests_key.pdfIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_ef6b878438d34803a38d9c35311b0bd7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pegebunov/69575773513.pdfIn PDF document text
    • https://52a1af19-6946-4c37-aba6-ab00a30e4874.filesusr.com/ugd/5dc3ca_7920279b615b4845a6c8708f57c5085a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bugutaj/substituting_variables_in_equations_worksheets.pdfIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_761d7157081b446e995fe2424e4b0aa6.pdf?index=trueIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_8075811273854b319603d05db890b204.pdf?index=trueIn PDF document text
    • http://zutugidod.onlinewebshop.net/bajewosuxuwuroduvefipo.pdfIn PDF document text
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_314f578dd44b4f96be192b913ff72471.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/begijufadi/xages.pdfIn PDF document text
    • https://a04ad255-06d6-4b17-97e7-91173d300295.filesusr.com/ugd/6864df_bf7b29e4aa7f4c05beffb158e42d9d8c.pdf?index=trueIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_d89c9f7b910d425e93e6e0a546b63071.pdf?index=trueIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_8719e5fcd08a476f831b9c8ab35514f6.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DE 4708 bytes
SHA-256: 2d946e5baa19437456e3cecab0779b7de9831e81140482a0b49b5c9c1d083187
font_01_sfnt_off000107dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DD 12204 bytes
SHA-256: d1a018e53e6dd74425af93e07affe07d6f9a5a13f7e889d9de8a8c70ac0d273b
font_02_sfnt_off000131bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BD 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e
font_03_sfnt_off000146ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146ED 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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