Malicious PDF — malware analysis report

Static analysis result for SHA-256 c351a2cb56ac74f0…

MALICIOUS

PDF

76.7 KB Created: 2021-03-26 10:19:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0f7836a8b9788d70a6ab2e7110d8cf61 SHA-1: 5c6ecb5fd8a27cea6913c4de1b3fffc3b3af294a SHA-256: c351a2cb56ac74f072337fe926076157bc2b13fd7477470890778e786b98a5e9
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with many pointing to disposable domains and exhibiting characteristics of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=how+to+improve+phonological+processing PDF link annotation
    • http://prognoz-football.club/auditoria_financiera_boliviap2dzh.pdfIn PDF document text
    • http://helplnstagramcontact6088758.com/98043906080qkf9h.pdfIn PDF document text
    • http://shoop-fo.ru/tamil_movie_2019_free_tamilrockers_isaiminia7g3u.pdfIn PDF document text
    • http://e-devletodeme.net/bapaxukolimeruradunudotibl2pm7.pdfIn PDF document text
    • http://ideal-it.fun/tazevogagukegukelamuoho73.pdfIn PDF document text
    • http://lajibodomemebev.66ghz.com/autocad_2014_software_free_softonic.pdfIn PDF document text
    • http://lnstagramservicecopyrights.com/his_mercy_is_more_sheet_music3r97p.pdfIn PDF document text
    • https://burufazifefep.weebly.com/uploads/1/3/4/5/134584298/tilisol.pdfIn PDF document text
    • http://msertis.xyz/the_weeknd_starboy_full_album_mp3l48nl.pdfIn PDF document text
    • https://sabiwivilo.weebly.com/uploads/1/3/4/3/134316676/fanedufusivu-sesovoki-degosumokisut-fejexitonalu.pdfIn PDF document text
    • http://vivofuma.66ghz.com/32623870022.pdfIn PDF document text
    • http://teksalon.xyz/capitalization_worksheets_4th_grade47re0.pdfIn PDF document text
    • https://torobekaxiwe.weebly.com/uploads/1/3/1/3/131380482/kuzofibuki.pdfIn PDF document text
    • http://vehicleinsusa.com/algorithms_of_oppressionpc5si.pdfIn PDF document text
    • http://swiss-gear-top.xyz/73840216831b932e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_6064c938182a4f8a803db646f9d246cf.pdf?index=trueIn PDF document text
    • http://xogowiv.epizy.com/the_vegetarian.pdfIn PDF document text
    • https://75cc4b12-69da-4024-8422-75f9303faa99.filesusr.com/ugd/d6c222_c045bdb25fcb449e9d3a57baa0de1f6b.pdf?index=trueIn PDF document text
    • http://tokekiloxak.epizy.com/how_do_i_hook_up_my_directv_swm.pdfIn PDF document text
    • http://vatoduk.rf.gd/common_roadside_shrubs_in_singapore.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_off0000f0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AF 5460 bytes
SHA-256: 3ad6f11b2a9ccf028a56c4d6694bc0e1c750b53635f5f6ecd93e697b4609c8af
font_01_sfnt_off0001032d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 10424 bytes
SHA-256: ee55012bbc1e5a23ce643fa27b149920f2f1d634c7111a35680ef636ea0c982d

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