Malicious PDF — malware analysis report

Static analysis result for SHA-256 5456e2bed1359e52…

MALICIOUS

PDF

74.2 KB Created: 2021-05-11 18:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0dff2a6ed0ef55667f3d0a6cb341c702 SHA-1: 9d8f6dd82a157d2cd8be590a98ccb2c159f2451a SHA-256: 5456e2bed1359e52fa053030b4df4cf5a9f8e64bf17a022978656ba10873d120
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a lure for a "Cloud 9 sushi half price" offer, which redirects to a suspicious URL. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is part of a link farm on disposable hosting, and ClamAV detected it as Pdf.Phishing.Trojan. The ML classifier also flagged it as malicious with high confidence. No scripts were extracted, but the embedded URLs and link farm behavior strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://maypoin.ru/strik?utm_term=cloud+9+sushi+half+price PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374379/normal_5ffefdb0cd08d.pdfIn PDF document text
    • http://sokobumoxagug.scienceontheweb.net/fuzubokaxiroxaxun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415935/normal_6057dbe872c44.pdfIn PDF document text
    • http://rosipale.scienceontheweb.net/shimano_acera_einstellen.pdfIn PDF document text
    • http://soldonlakewood.com/better_business_bureau_michigan_numberjquj8.pdfIn PDF document text
    • http://topuniversityru.fun/8771680731tzx97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497353/normal_5fe26b8851269.pdfIn PDF document text
    • http://zedakobogesa.mypressonline.com/einkommensteuer_2020_anlage_n.pdfIn PDF document text
    • http://takipleskazan.org/pegidujadurudasuvhf13.pdfIn PDF document text
    • http://gejurabek.getenjoyment.net/tavijivijuwujoreraxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gateme/linwood_michigan_fishing_report.pdfIn PDF document text
    • https://e5aadbcf-511f-4ee2-989a-4410a22eeed0.filesusr.com/ugd/64930c_3388095f75d449dab916f0421f9e2fed.pdf?index=trueIn PDF document text
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_ab3d4780a68246db93bcd284b86247ba.pdf?index=trueIn PDF document text
    • http://tebaputazaxuva.myartsonline.com/reflexin_sobre_el_mito_de_la_caverna_de_platn.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/what_is_service_oriented_architecture_and_web_services.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7f8ecb2-3f79-4e86-8dee-864d783f5942/dr._andreas_moritz_liver_and_gallbladder_flush.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/rancilio_silvia_pid_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/bala_bala_song_free_pagalworld.pdfIn PDF document text
    • https://0a9dc515-c6d9-419f-b4de-d801a8c2a39b.filesusr.com/ugd/760a4c_78629b1984c342e9b6fa28cb21b3e913.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bceee21-9537-4d2f-81aa-61281940784d/advantium_240_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d409232d-9602-44f2-a001-f4903ae467e6/69657236456.pdfIn PDF document text
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_a37a6ca80386456c9ab1937738159003.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_off0000e135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE135 5304 bytes
SHA-256: b94f565988a43fcdd9ee9e8244d821f8689d55be453badf1fe72ac9ce77c2570
font_01_sfnt_off0000f336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF336 11756 bytes
SHA-256: ac9a171f3cf7a36696fd22676970e73e7535df5b6ef65f49b3d52b0eabe713b1

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