Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c64593ee2fedddc…

MALICIOUS

PDF

89.2 KB Created: 2021-03-20 13:17:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 89c85bf185eee71d55ac5fb8d863eaa1 SHA-1: 2eb9316b652afb4f17859071ef1d9098779a0151 SHA-256: 4c64593ee2fedddc58567f37b5b9caa9157ecd9c7da5717b977b298ae738fad8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration of them pointing to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://pelibifir.ru/strik?utm_term=experience+and+education+john+dewey PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379851/normal_603599b5ca4a6.pdfIn PDF document text
    • http://wotomonexu.22web.org/24722299081.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383582/normal_5fd0716cafa8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388815/normal_6026b7f7bef65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476952/normal_605057b25f404.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454668/normal_6010354d6f569.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417216/normal_5ff779862e074.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/joss_whedon_wonder_woman_screenplayvlu5j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453338/normal_5fdf19f1b69a1.pdfIn PDF document text
    • http://bigowet.xyz/635219162883kywu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446782/normal_5fc6a2210b76f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470038/normal_6031e46cf0078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414339/normal_602f3146de745.pdfIn PDF document text
    • http://kfnwejfnkwheklf.space/815269389032quou.pdfIn PDF document text
    • http://shoop-fm.ru/idalberto_chiavenato_introduccin_a4oxde.pdfIn PDF document text
    • http://fkpravo.ru/dell_xps_8500_update_biosuswlr.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/5333d739-6aae-4fca-868e-651bfbb2001f/orion_tv_remote_control_app.pdfIn PDF document text
    • http://suzowow.rf.gd/free_able_templates_for_christmas_invitations.pdfIn PDF document text
    • http://gigufapaw.epizy.com/defying_gravity_sheet_music_trumpet_free.pdfIn PDF document text
    • http://zisafaziga.epizy.com/banakubedonuje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf8c04a4-b414-4a95-8018-a3b2b45234a8/overcoming_gravity_book_depository.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cb561a3-c453-4562-b000-941aed4faea0/husqvarna_125l_carburetor_adjustment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5255d9d-40eb-4210-a09e-235abad36000/how_to_remove_splat_hair_dye_from_your_skin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99aeda23-a46d-410a-96b6-a71390f2d554/papoxanopajudorixesiwe.pdfIn PDF document text
    • http://garamerese.rf.gd/insinkerator_pro_333_parts_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/855b9ca3-de8a-4f8c-ba81-cfc903cce0bc/pibadixonovolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f79fdac-0454-4f66-a080-220a3699a652/60771507959.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/168b0692-302e-4631-957c-ceed7a349c78/bible_quiz_for_kids.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25704205-e51d-49f4-b59c-75d1567179f1/xadadafisafugafomise.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_off000120b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B6 5248 bytes
SHA-256: 97debb3a436a87c83cc2c3c13ad7963d8ba51008d7e41628fa43dff5a7a62606
font_01_sfnt_off000132ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AB 10648 bytes
SHA-256: 2a3f94119f6c5f4e04e2792c2387b4cee6f6ef53cfbc39240769d6841d160989

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