Malicious PDF — malware analysis report

Static analysis result for SHA-256 278b4875def25ad3…

MALICIOUS

PDF

89.4 KB Created: 2021-04-15 07:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: dbd6fe5202e6cc323ef17115bbd4ed06 SHA-1: 2eafee32b2aab14a990bbc4f82b56d351a2aab8e SHA-256: 278b4875def25ad3782f6ad0e084bef9eeb88430a4abb57bd0adcc6509c99a59
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is part of a link farm hosted on disposable infrastructure, pointing towards phishing or malware distribution. The primary malicious URL identified is https://fokemale.ru/strik.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://fokemale.ru/strik?utm_term=what+is+the+best+knot+for+joining+two+rope PDF link annotation
    • http://xenalebosob.scienceontheweb.net/pixuvoxakexe.pdfIn PDF document text
    • https://cdn.sqhk.co/gutinisiv/djdgdgg/monster_hunter_world_iceborne_alatreon_tips.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/pharmacotherapy_casebook_a_patient_focused_approach_10e_instructor_guide.pdfIn PDF document text
    • http://gobofan.iblogger.org/tijojobukowo.pdfIn PDF document text
    • http://jugonosimov.22web.org/17999262294.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447641/normal_602d2cee777f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411694/normal_5fdc1574bcdd0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464739/normal_5fc7fa6d11d2b.pdfIn PDF document text
    • https://cdn.sqhk.co/xokipuxat/heWgdOi/the_elder_scrolls_legends_decks_2020.pdfIn PDF document text
    • http://rawokixe.22web.org/why_are_some_music_notes_upside_down.pdfIn PDF document text
    • https://cdn.sqhk.co/fekerepusa/ijYFhij/32037305749.pdfIn PDF document text
    • http://lexanizisujufum.66ghz.com/sekobugetiwomil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kijonag.onlinewebshop.net/biblia_de_estudio_vida_plena_gratis.pdfIn PDF document text
    • http://kexabomatifub.epizy.com/book_wing_chun.pdfIn PDF document text
    • https://12350a4d-732a-4148-85a7-4fa27f2a77ec.filesusr.com/ugd/17beed_64707d912fe744fc8ca927ef987fd961.pdf?index=trueIn PDF document text
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_96197d661ce64642b0a9d0417d826a58.pdf?index=trueIn PDF document text
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_6525e73db780497fbe9a10cf077ffaec.pdf?index=trueIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/cerebro_creativo_y_ludico.pdfIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_3cd6bba1146a4f29808411dc0540bea8.pdf?index=trueIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_c914bf7b8e5c4782a655546d85f8b0af.pdf?index=trueIn PDF document text
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_f4497f8baa28453780e71b5b8a6a1400.pdf?index=trueIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_c46fcdd452de4665b5a81a6d15c2f7da.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B88 5516 bytes
SHA-256: 9dbeb4909193c04ede18c62b63f9973e504cbff94c1415d1997631a0606f3103
font_01_sfnt_off00011e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E66 10572 bytes
SHA-256: 11d808b0059a6ce93e04926f17f2918ec1e235574fbc0915929314289a86f643
font_02_sfnt_off000142c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C3 16128 bytes
SHA-256: 42abe914620b2e0928acb40758c4fde3aecee7f1216f0f76873c8d79813b4024