Malicious PDF — malware analysis report

Static analysis result for SHA-256 519cfe9025f02f6c…

MALICIOUS

PDF

79.6 KB Created: 2021-04-17 05:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 01e8796ce7b211b3f75d40c544d4b8dc SHA-1: 1e8c0a9f8300e1bd27fcbcef87326249b2787ad5 SHA-256: 519cfe9025f02f6c02916a197ee41573b4d238432758952bad87274dc48323cd
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://golowaki.ru/strik?utm_term=income+summary+is+a+temporary+account+only+used+for+the+closing+process.+true+or+false PDF link annotation
    • http://topcreditcheck.info/how_to_become_a_vet_tech_texasah1yg.pdfIn PDF document text
    • http://sujiwajarow.22web.org/number_to_string_format_matlab.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/la_la_land_ukulele_chordskjmpe.pdfIn PDF document text
    • https://lomixefewagad.weebly.com/uploads/1/3/4/5/134592496/777c64a.pdfIn PDF document text
    • https://gaxiworet.weebly.com/uploads/1/3/1/4/131408942/fbe6e1d5a0b4.pdfIn PDF document text
    • https://pasezarovatif.weebly.com/uploads/1/3/4/8/134858127/24ec56882a095d.pdfIn PDF document text
    • https://xuzatikanuji.weebly.com/uploads/1/3/0/7/130775198/1464783.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382976/normal_6054d0b17a235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456999/normal_603d746dd2bdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481285/normal_600a4a67578fc.pdfIn PDF document text
    • http://stnold.com/ps3_move_controller_battery_replacementh3etr.pdfIn PDF document text
    • https://kitejunozog.weebly.com/uploads/1/3/4/3/134319277/gakusedavorefagefex.pdfIn PDF document text
    • http://pogadai.xyz/how_do_you_communicate_effectively_with_patientsw1a3t.pdfIn PDF document text
    • http://kismyketio.com/dogigowantkkl.pdfIn PDF document text
    • http://domainlimax.xyz/migofawumuferidnowq.pdfIn PDF document text
    • http://bluhgang.best/fanufukiwb64vq.pdfIn PDF document text
    • http://keto-menu.online/confederation_of_british_industry_annual_report_2018z8ma8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374963/normal_5fe10608b6505.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_d921ee01da2e4aa2a2ef224ca2c254d6.pdf?index=trueIn PDF document text
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_592c55b12f0f41f48ae2713f71cdfb99.pdf?index=trueIn PDF document text
    • http://vopepeto.epizy.com/how_to_change_battery_in_kidde_fyrnetics_smoke_alarm.pdfIn PDF document text
    • https://3cd6846c-369c-4875-9c63-132df726a2dd.filesusr.com/ugd/7ab50f_24901ee09e8e4886a02884581468353c.pdf?index=trueIn PDF document text
    • http://porojerosisogu.rf.gd/universal_kathisma_2019_songs.pdfIn PDF document text
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_35c30ec90fe9482db37e7ff1bee771f5.pdf?index=trueIn PDF document text
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_576e357f0226421b8074a5f456b685d8.pdf?index=trueIn PDF document text
    • http://vegizutix.rf.gd/ielts_writing_task_2_download.pdfIn PDF document text
    • http://favebabusapador.rf.gd/40909268787.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2F 5524 bytes
SHA-256: 5f5e9f1b72e245455d376d395ff75e24884a0357a721b6995a842d6485d18db3
font_01_sfnt_off0000fcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC2 10816 bytes
SHA-256: 9554a3203081a68b7793d6aebe3930c8293eb0f881c55abf8d8e5ff1e5b225b8
font_02_sfnt_off000121b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B6 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2