Malicious PDF — malware analysis report

Static analysis result for SHA-256 171deb8799408f06…

MALICIOUS

PDF

84.4 KB Created: 2021-06-12 06:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5601187a5f7072c5dbde3680de46629a SHA-1: 3e670c5aedb20152044b153391985da6e322a0c5 SHA-256: 171deb8799408f066817e86071596b33c232a9a07e4f31d738f641cc9d404c2a
226 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of a 'Password-protected archive handoff' heuristic suggests the document may be a lure to trick users into downloading and then decrypting a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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://krisoc.ru/pbw?utm_term=watch+high+school+musical+3+online+free+gomovies PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446259/normal_6055a74e5d6a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482426/normal_5ff851b71de6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402944/normal_601bde971d408.pdfIn PDF document text
    • https://lajejajutabi.weebly.com/uploads/1/3/6/0/136050508/5184771.pdfIn PDF document text
    • https://fozikevogakol.weebly.com/uploads/1/3/1/4/131437046/guguvudaxux.pdfIn PDF document text
    • https://xowuxuwakewobi.weebly.com/uploads/1/3/4/8/134853014/nelunobipaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370529/normal_5fd9394bcaa34.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4495694/normal_60b117c00d9bb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kiwuwas.pbworks.com/w/file/fetch/144616788/tutavijimerijuzep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f6157a0-82e0-468a-aa72-b2f1f23d05d5/why_does_smoke_alarm_keep_beeping_after_changing_battery.pdfIn PDF document text
    • http://pekazaxe.pbworks.com/w/file/fetch/144994578/yearly_budget_template_excel_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9dfdcb4-29a7-4114-9541-42c023fe8f40/descargar_diccionario_oxford_ingles_espaol_gratis_para_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12398713-c761-46fc-afd5-6d38466d2aac/kerbal_space_program_essential_mods_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd012cc-a5f8-4ff6-ae69-283b399fe0ee/how_do_i_sync_my_rogers_ignite_remote_to_my_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49c60326-ae91-4683-a2fe-2b9ea90581ee/suninokenazonutodok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/707e6e70-b233-4a53-bd0b-7d5746f3cb08/jezidotevizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50489cc5-d287-439f-88a4-6ffd43ede043/barufigakudibu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20d0f536-f26b-4a35-8942-02673cf71190/jozafiwusadebigawotose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f87fb98-f2e3-4b5e-8411-b3400b1ccb38/juponeb.pdfIn PDF document text
    • http://ravowibosu.pbworks.com/w/file/fetch/144443733/22304353879.pdfIn PDF document text
    • http://febevolojezu.pbworks.com/f/96879275686.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d6f7c62-012c-42a1-a1fb-694f187f30b1/redukomukosesivok.pdfIn PDF document text
    • http://jejosuxiz.pbworks.com/f/11643196394.pdfIn PDF document text
    • http://kolasotosexu.pbworks.com/w/file/fetch/145098513/password_rar_unlocker_online.pdfIn PDF document text
    • http://barumena.pbworks.com/w/file/fetch/144465708/wodoral.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_off000109ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CA 5532 bytes
SHA-256: bcd4a0967c73a3693d6ef12bde68588b866cb73a43cbfc2c5e8aaf463cc963f2
font_01_sfnt_off00011c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C84 11668 bytes
SHA-256: 79c7560b5ca59ba4f64f61784a5d78ec7af9ae8bbeeb6016bec0bb42136665ef