Malicious PDF — malware analysis report

Static analysis result for SHA-256 47600fa8e340dd76…

MALICIOUS

PDF

79.0 KB Created: 2021-04-22 22:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fb677333979cf97516534815df879fe9 SHA-1: de3c1ad4357dac36fe9b295c72910aa59f77f00c SHA-256: 47600fa8e340dd7688aedf30208fbe69571018f3f903053f8b0435bcc4fff83a
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://fokemale.ru/strik?utm_term=feeling+words+for+adults PDF link annotation
    • http://tricitysikhs.com/live_stream_tv_free_trial7q49m.pdfIn PDF document text
    • http://demask.fun/84093256051ffx28.pdfIn PDF document text
    • http://pifemukopisare.sportsontheweb.net/ielts_speaking_may_to_august_2020.pdfIn PDF document text
    • http://majusenise.sportsontheweb.net/pipexulenuzuvatila.pdfIn PDF document text
    • http://zeriwegitesokom.iblogger.org/allen_offline_test_series_for_neet_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/lipisedopila/ibTjiBt/70602263256.pdfIn PDF document text
    • https://cdn.sqhk.co/lafixafif/ja7hcT5/basic_tv_launcher.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://050a9d39-d8a1-4107-8be8-b2b70b72e454.filesusr.com/ugd/5262df_a47cf66bf5da467e8f8b179467927932.pdf?index=trueIn PDF document text
    • http://nujivoforegiv.rf.gd/advanced_cardiovascular_life_support_provider_manual.pdfIn PDF document text
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_4c54116d34264d6faacc0b1edb1b3802.pdf?index=trueIn PDF document text
    • http://datufubizut.rf.gd/advertising_objectives.pdfIn PDF document text
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_4ec25b60659a40ddad68c4a3184831a7.pdf?index=trueIn PDF document text
    • https://d33b8dfc-9792-4d26-9d81-613d0bd32a71.filesusr.com/ugd/d34367_414c0aee48ea4af197e9001b71814dcb.pdf?index=trueIn PDF document text
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_5a4e9f12a4354188ba3b90a686df5669.pdf?index=trueIn PDF document text
    • http://zovixiluru.epizy.com/contabilidad_de_costos_un_enfoque_gerencial_12_edicion_solucionario.pdfIn PDF document text
    • http://bugenuvumap.atwebpages.com/orthographic_projection_multiple_choice_questions.pdfIn PDF document text
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_40ee29ae60cb4995a283807f03ba8cf8.pdf?index=trueIn PDF document text
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_ae2b86db1d1d4ad282fdcf93c21832f2.pdf?index=trueIn PDF document text
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_b1313001ecff476097c4aac9401f82b8.pdf?index=trueIn PDF document text
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_522f6e9a324d47b1b56892120bae0b89.pdf?index=trueIn 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_off0000f731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF731 5124 bytes
SHA-256: 21dbdb8fbb50d8aca570ad025b196db65d1b5e512a68dcf2a7192b923f91716e
font_01_sfnt_off000108c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C2 11220 bytes
SHA-256: 848a4bf7d488aa67260e8c645ddac267324557ab7882b97184177b8bbda96447