Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79fa39287487f6b…

MALICIOUS

PDF

72.4 KB Created: 2021-02-10 09:39:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 070a2af4d0cf15c331029a54ad529b07 SHA-1: 12c2894efb38ef6523ab52a252f276eeacee50d7 SHA-256: a79fa39287487f6b5a6d5276ed508e1d79374b16aab8f790e593afb9f5ec9e26
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs and is flagged as a link farm on disposable hosting, with one URL specifically mentioning 'sony vegas cracked version'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests a lure to download potentially malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/123?utm_term=sony+vegas+cracked+version
    • https://cdn.sqhk.co/kekotenonaxu/d3ja6if/17805606279.pdf
    • https://cdn.sqhk.co/tamoravuwera/fgj8gdz/cinemark_movie_showtimes_near_me.pdf
    • https://cdn.sqhk.co/nuxezitowefi/47xFyjh/island_beach_state_park_directions.pdf
    • https://cdn-cms.f-static.net/uploads/4450034/normal_600aca50c51d9.pdf
    • https://cdn.sqhk.co/bulunazi/heWijOp/sanejit.pdf
    • http://servicesforsupport.com/preston_park_run_ielts_answersc4pdp.pdf
    • https://subozabi.weebly.com/uploads/1/3/2/7/132710736/04cb7147d507f.pdf
    • https://sulovuve.weebly.com/uploads/1/3/5/9/135973568/bilelovotul_gebaluteser_mogozix.pdf
    • http://wobijamitiz.iblogger.org/new_elementary_mathematics_syllabus_d.pdf
    • https://cdn.sqhk.co/wirubetena/Hjjbzl8/kilezidadepujase.pdf
    • https://viwifigejemi.weebly.com/uploads/1/3/0/8/130814408/rokuzimilabezojupu.pdf
    • http://btsworld.org/33879100009tpnm7.pdf
    • http://parubexe.iblogger.org/legesinesosokufusatozum.pdf
    • http://watertea.space/952641497456po2n.pdf
    • http://voiprormul.xyz/adoptable_storage_apk_lollipopa3bxr.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gajabedafot/angular_component_change_templateurl_dynamically.pdf
    • https://s3.amazonaws.com/davubewu/chess_tactics_free_for_pc.pdf
    • http://fidotetunuxezi.epizy.com/beaver_lake_fishing_report_april_2019.pdf
    • http://rajemezipuz.rf.gd/acc._teletalk._com._bd_application_form.pdf
    • https://s3.amazonaws.com/mexijegedakol/fidugerudoworoxejuxokiz.pdf
    • https://s3.amazonaws.com/fusopoxipo/mawikijekanivatonajetaz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc65.bin
437157d85f363140683104ad43dcf25be407df3c6e3d5fd1ee65c3bacbf02eac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC65 5404 bytes
font_01_sfnt_off0000eee9.bin
c4ab4143cdcdbeb3645ba51658d52e3555bb8706be3e6b07e7b8eb56da836648		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 10444 bytes

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