Malicious PDF — malware analysis report

Static analysis result for SHA-256 15400337467b8804…

MALICIOUS

PDF

91.2 KB Created: 2021-05-07 03:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f361f2dd563129201f547547c14c3c4e SHA-1: 533374ef5cc74867030a07b99372560a25ab58ac SHA-256: 15400337467b8804efaeee270a207e733cfae39f5533a5d80550e6e6bf4d6518
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains an embedded URI pointing to 'nipisod.ru', which is likely used for phishing or to download a secondary payload. The PDF also exhibits characteristics of a link farm, further suggesting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/strik?utm_term=learn+english+advanced+level+app PDF link annotation
    • https://s3.amazonaws.com/nuxulikiwab/bleacher_report_live_app_not_working.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415061/normal_6035d758584e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479938/normal_5ff910354f6ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450350/normal_60661b2716795.pdfIn PDF document text
    • http://pufivuziviv.mypressonline.com/xasul.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/84196256949.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/61807063639.pdfIn PDF document text
    • http://sifisomatexow.sportsontheweb.net/apache_hadoop_architecture.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379473/normal_60121c8a9355e.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/ppap_manual_aiag.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/essex_bus_route_91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491669/normal_6018a70e45b75.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://labazesunug.epizy.com/tekigunifolurosakipugafob.pdfIn PDF document text
    • http://losalevova.epizy.com/advaita_vedanta_philosophy.pdfIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_2ae5c3da26fc44efa9f427c00fc88833.pdf?index=trueIn PDF document text
    • http://gixiluvigatekij.atwebpages.com/geotechnical_engineering_salary_california.pdfIn PDF document text
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_ba234d7834a04530871b68a86544e021.pdf?index=trueIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_14935abbc9524538ba585c8ad0509484.pdf?index=trueIn PDF document text
    • https://320f262d-053d-461a-9009-498fa3b044f5.filesusr.com/ugd/8e680a_fa8e6eddc9c14c08b707c95bfeaa851e.pdf?index=trueIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_3063fa83a2cc4cb3aaec4a39ec3c43fc.pdf?index=trueIn PDF document text
    • http://wopaxigaromuf.epizy.com/dragon_nest_mobile_sorceress_specialization_guide.pdfIn PDF document text
    • http://fuguzametekobo.myartsonline.com/time_value_of_money_exercises.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DB 5336 bytes
SHA-256: a1719fd7bb9fa0474979fb088316aa356d6b33b470cd094c0911b15e99c864bf
font_01_sfnt_off000117fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FE 2504 bytes
SHA-256: 2b4976bd5700831a6739eb7f99079ca960227e63ecdf520b00463d8acf8bf440
font_02_sfnt_off000122e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E5 11160 bytes
SHA-256: 5f8faaccd10cfeebed329d5ceb9dc714e0bda472518d27422262b7c630355696
font_03_sfnt_off00014901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14901 16332 bytes
SHA-256: 69d723212eb6dd1954cef9b4649bd4df6eb17a6f495b2db8137d34beed6776af