Malicious PDF — malware analysis report

Static analysis result for SHA-256 b566168398f95c36…

MALICIOUS

PDF

76.9 KB Created: 2021-03-10 15:26:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9d0b0897bc69d5acfd5f4aa6608744d SHA-1: bda5aaf0d28b8bbc2d87dfd82b552965ccd57f89 SHA-256: b566168398f95c360d74c08900cba41fd77ae080018d868c78a3339d57539688
226 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm for SEO manipulation or to host further malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be intended to trick users into providing a password for an archive, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ponafet.ru/wix?keyword=santa+claus+and+his+old+lady+lyrics
    • http://tujemet.scienceontheweb.net/how_do_i_replace_my_hawaii_state_id.pdf
    • https://javekekowunafot.weebly.com/uploads/1/3/5/3/135324960/lizelo.pdf
    • https://cdn-cms.f-static.net/uploads/4503033/normal_601c92b7d96ee.pdf
    • https://static.s123-cdn-static.com/uploads/4378619/normal_5fe156c5a2266.pdf
    • https://lepamume.weebly.com/uploads/1/3/4/8/134882258/6612130.pdf
    • http://vuxilenusip.mypressonline.com/10814374332.pdf
    • https://cdn-cms.f-static.net/uploads/4419826/normal_6015a0c034a32.pdf
    • https://rigafimer.weebly.com/uploads/1/3/4/9/134901715/wivezo.pdf
    • https://xosulokut.weebly.com/uploads/1/3/4/4/134466674/wokusonekolama_metukuget.pdf
    • https://zuxadozi.weebly.com/uploads/1/3/4/6/134662888/a712f8f17acf.pdf
    • https://sefokasezasun.weebly.com/uploads/1/3/4/6/134690402/xilidej_suloxemovajo.pdf
    • https://jiresuzava.weebly.com/uploads/1/3/4/7/134706808/b8d3bdc.pdf
    • https://cdn-cms.f-static.net/uploads/4417040/normal_5fdc6f88f1149.pdf
    • https://static.s123-cdn-static.com/uploads/4481839/normal_600270262a318.pdf
    • https://ripukalogud.weebly.com/uploads/1/3/4/3/134391837/9484278.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nupuzawov.onlinewebshop.net/73638083985.pdf
    • https://uploads.strikinglycdn.com/files/d88957df-0394-491f-866d-65d38e0f4032/dlink_router_admin_password_not_working.pdf
    • https://uploads.strikinglycdn.com/files/c9d6b242-a271-4485-b28d-0a95b5834b3e/corresponding_angles_worksheets_free.pdf
    • https://uploads.strikinglycdn.com/files/676fef06-4c15-49a2-b107-c1637b2d340f/what_electron_group_geometry_is_associated_with_sp_hybridization.pdf
    • http://fojosotum.myartsonline.com/how_do_i_reset_my_radio_thermostat.pdf
    • http://fuvarijes.atwebpages.com/hp_12c_mortgage_calculator_instructions.pdf
    • http://gamelaluwer.myartsonline.com/calendrier_2020_avec_numero_semaine.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_off0000f1af.bin
aa7a0b579e30e2f347d6cea931ab10d40817fd60f8e4212765d12436b9cdddd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AF 5232 bytes
font_01_sfnt_off00010372.bin
ec0cb9897534837f7118f5845490253c84ff9851f217052ef789084daf157168		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10372 10208 bytes

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