Malicious PDF — malware analysis report

Static analysis result for SHA-256 6763ead421c0f3fd…

MALICIOUS

PDF

92.8 KB Created: 2021-03-24 05:16:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: be4ff54182101c3b9533d97ab97a47b2 SHA-1: 59551f4768319de8f1dbab51ab5f6b2e9943b540 SHA-256: 6763ead421c0f3fd794de1337cd31792cf4523aab909d97d1da63fa15834c181
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 0.9996

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://dafemum.ru/123?utm_term=chottanikkara+amma+devotional+songs+free PDF link annotation
    • http://xavelodezazil.iblogger.org/2006_mercruiser_5.0_mpi_fuel_filter.pdfIn PDF document text
    • http://cardioactiveufficiale.site/fce_speaking_test_sample65o13.pdfIn PDF document text
    • http://straponartist.com/ginuxifusiveviduvolo9uxyc.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/magic_tree_house_merlin_missions_books_1-4_boxed_set_magic_tree_house_r_merlin_mission.pdfIn PDF document text
    • http://zugugalepew.mypressonline.com/47182135762.pdfIn PDF document text
    • http://pelubexeto.getenjoyment.net/conjuguemos_answers_key.pdfIn PDF document text
    • http://vwwv-avito.online/lemumogigitesi34hsm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bc13934-49ae-410d-873d-c8cc936aa88d/zuwebagusezibod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9066eb3-2322-462f-bba9-e7de1b347f66/21053857309.pdfIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_60c9132696c1429bba359cd25a668dc4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb8e6847-74ef-4374-b24b-93b0c836c53b/public_administration_associates_degree_salary.pdfIn PDF document text
    • http://xebowuruno.epizy.com/harry_potter_and_the_half_blood_prince_wikipedia_bahasa_indonesia.pdfIn PDF document text
    • http://funadorexizuju.rf.gd/oxford_law_dictionary_online.pdfIn PDF document text
    • http://pimoxonevuwewax.atwebpages.com/canvas_model_business.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05b4f27b-b8c7-4a2e-8828-15e57a3cea16/intervention_and_teaching_strategies_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74aa419f-426e-4ae4-8533-132e33030037/96786163721.pdfIn PDF document text
    • https://24b051fc-04af-4e2d-8b9e-4e75c06063ec.filesusr.com/ugd/1a488c_907b067637194c3b9d974bc523646503.pdf?index=trueIn PDF document text
    • http://katetagozu.epizy.com/nikekof.pdfIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_e66c3351da204a44abf73199ac845e54.pdf?index=trueIn PDF document text
    • http://xoxekojut.onlinewebshop.net/easy_piano_christmas_carols.pdfIn PDF document text
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_4a3d99c6f26f4032b99a05c8a9b6f160.pdf?index=trueIn PDF document text
    • http://zasuwunal.myartsonline.com/18589824739.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_off00012ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBC 5352 bytes
SHA-256: fe5133a4759de5f2afa9aa44470b6468a8b78eaff83a9bd2aa0b430690679673
font_01_sfnt_off000140c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C6 11196 bytes
SHA-256: 40c48aa59a52548e096f266482d43c19faa72e21aa45c0b7cf8cddfeff02a2de