Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f79a76dd0d424c…

MALICIOUS

PDF

71.7 KB Created: 2021-06-05 18:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c13b5a751a566e67b1422b6d2ddd7c90 SHA-1: 4109d36f59aa6a30e3436d3dcdd91ed6ad1c428d SHA-256: 25f79a76dd0d424cffcc976314032d373ba79277d3064e05e7d3bcb378d6902e
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as a link farm containing a mass of external URIs, with a high ML classifier score and ClamAV detection. The document body contains garbled text and a URL that appears to be a search query, suggesting it is not intended for legitimate user consumption. The primary function appears to be hosting a large number of links, likely for SEO manipulation or to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://krisoc.ru/pbw?utm_term=sorboto+mongolo+radhe+binodini+rai+mp3+song+download+webmusic PDF link annotation
    • https://javesuput.weebly.com/uploads/1/3/0/8/130873829/xodoj.pdfIn PDF document text
    • https://xirozakopep.weebly.com/uploads/1/3/4/7/134719339/a3ef03ab3251.pdfIn PDF document text
    • https://fuwipinax.weebly.com/uploads/1/3/4/0/134016709/bufaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381531/normal_5feba118b8404.pdfIn PDF document text
    • https://rigavimiba.weebly.com/uploads/1/3/0/8/130814992/lesiwasujaz_jafovozijojeju_zifitipakixufo_nanodavu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504839/normal_605465bb1e1fb.pdfIn PDF document text
    • https://fodumalape.weebly.com/uploads/1/3/2/6/132695584/b41cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_6020c0b2a9b68.pdfIn PDF document text
    • https://jonusozulat.weebly.com/uploads/1/3/4/5/134523624/voxetajaremadupa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lomexalipele.pbworks.com/f/can_you_get_more_watch_faces_for_apple_watch.pdfIn PDF document text
    • http://numefen.pbworks.com/w/file/fetch/144539517/13702387218.pdfIn PDF document text
    • http://didaneguk.pbworks.com/w/file/fetch/144427851/fanuc_series_ot_parameter_manual_download.pdfIn PDF document text
    • http://vikowezanipe.pbworks.com/f/microsoft_flight_simulator_x_download_full_version_pc.pdfIn PDF document text
    • http://zekodunu.pbworks.com/w/file/fetch/144447552/zojapunevusavemunu.pdfIn PDF document text
    • http://sufizilofab.pbworks.com/w/file/fetch/144526566/41450965340.pdfIn PDF document text
    • http://gulisapil.pbworks.com/w/file/fetch/144419733/la_princesa_que_creia_en_los_cuentos_de_hadas_sinopsis.pdfIn PDF document text
    • http://ziriwuru.pbworks.com/f/how_to_change_label_size_on_dymo_connect.pdfIn PDF document text
    • http://kuzimotum.pbworks.com/f/xelububajalev.pdfIn PDF document text
    • http://jajafad.pbworks.com/f/como_conseguir_diamantes_en_free_fire_gratis_sin_aplicaciones_2020.pdfIn PDF document text
    • http://genarozep.pbworks.com/w/file/fetch/144490218/20963971011.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_off0000d905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD905 5984 bytes
SHA-256: 70b11a9dc7428afaca492d14e984d0a286f7602b19310f6fac6b33d520b52963
font_01_sfnt_off0000ed43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED43 10416 bytes
SHA-256: 5ca49392b3d597579c97fee52893e980abb4f672c9ebacc1d7ed8827b05866a4