Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac863517c1db3b5e…

MALICIOUS

PDF

78.1 KB Created: 2021-03-29 17:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6fd81b12c24d3115d14effea627dab45 SHA-1: 242e7f5724699a2330db45776873380d10921492 SHA-256: ac863517c1db3b5ece74fb4b13a87607641bff7b03731d5f9c6eab3089b94982
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a high concentration of them pointing to disposable domains and potentially malicious hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the classification as a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/award?keyword=pneumatic+valve+types+pdf PDF link annotation
    • http://niwizonoleror.mywebcommunity.org/analytical_essay_writing.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451945/normal_5fc8181214237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403119/normal_603028fcc7dfe.pdfIn PDF document text
    • http://sozefubuvigapi.iblogger.org/cambridge_checkpoint_mathematics_coursebook_7_answers_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471455/normal_6041217dcb879.pdfIn PDF document text
    • http://gelufose.scienceontheweb.net/kumuzemizoravilitedid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466659/normal_5fcaf887e7e4d.pdfIn PDF document text
    • http://xufonewujisos.scienceontheweb.net/86649681498.pdfIn PDF document text
    • http://difuwikikum.iblogger.org/sundara_kandam_tamil_book_online.pdfIn PDF document text
    • http://nufefabipiketod.22web.org/1080p_bollywood_video_songs_2019.pdfIn PDF document text
    • http://fafesixokegigi.getenjoyment.net/barbituric_acid_synthesis.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/bokuwojogu.pdfIn PDF document text
    • http://nutupiwerumad.66ghz.com/doraemon_ending_song.pdfIn PDF document text
    • http://ranupila.mywebcommunity.org/convert_to_word_file_download.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/223da422-80f7-48ec-ad0f-239ed5814c76/jepazal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46c64111-f61f-49a1-97b8-13fbc48e5e6a/single_pole_fishing_for_crappie.pdfIn PDF document text
    • http://sikirubuguje.epizy.com/xisiliboxeza.pdfIn PDF document text
    • http://junaken.onlinewebshop.net/international_phonetic_alphabet_definition.pdfIn PDF document text
    • http://dakafatuvuguviz.atwebpages.com/dimitomoxaginolavifekanun.pdfIn PDF document text
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_116829ebfb0844479891ef9839458b4a.pdf?index=trueIn PDF document text
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_736a9f2de8f846d19f5f9a496e954718.pdf?index=trueIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_33df1cdd5e6c4025b61db2f486944ada.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_off0000f5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BE 5368 bytes
SHA-256: ad04442b29336a8d949499c740a1529b505c2af2fe10557728fd367a86243e49
font_01_sfnt_off00010800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10800 10308 bytes
SHA-256: fc37f18ecb1f408a5bc8bbf1de8fd27de8bd486dc1e1f7844e4a25bbcc9868e8

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