Malicious PDF — malware analysis report

Static analysis result for SHA-256 506b8f3bb594ec6a…

MALICIOUS

PDF

85.6 KB Created: 2021-05-02 21:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb5ca0ef261805c7024a2b7f549b3561 SHA-1: da62b12843dba34a186804f8aed648e4683cc460 SHA-256: 506b8f3bb594ec6a678d86483c8e2625a5684a899c89ed0525e7e0ccfb1b6a1e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated, suggesting an attempt to create a link farm for SEO manipulation. One of the primary URLs, 'https://jumiwimov.ru/strik?utm_term=singer+tradition+tension+issues', is flagged as suspicious. ClamAV detection and ML classification strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The embedded artifacts and PDF structure do not contain executable scripts, but the overall pattern points to a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=singer+tradition+tension+issues
    • https://cdn-cms.f-static.net/uploads/4468563/normal_604cb4636c4d8.pdf
    • https://cdn-cms.f-static.net/uploads/4501479/normal_606e64f575fe8.pdf
    • https://cdn-cms.f-static.net/uploads/4489994/normal_603ff61b27ad5.pdf
    • https://cdn-cms.f-static.net/uploads/4373519/normal_600eda1a9a369.pdf
    • http://mekozeka.66ghz.com/recurrent_thrush_treatment_guidelines.pdf
    • https://cdn-cms.f-static.net/uploads/4385410/normal_601e840a79bed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9ec55029-67b1-4fe0-9a5d-40fd638ac594.filesusr.com/ugd/dc5a51_56148aa18a624514aadef48f2a6feb2c.pdf?index=true
    • http://pifajipap.rf.gd/kejoxegitodasag.pdf
    • https://uploads.strikinglycdn.com/files/b1335e04-feac-491e-a61c-2fc4dba01ba4/pasar_de_milesimas_de_pulgada_a_milimetros.pdf
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_cc54eb940881434b80359f223473dca4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/40bbc502-0a6b-45b0-91db-0d527043a90e/airplane_flying_handbook_chandelles.pdf
    • http://dirujuwut.epizy.com/how_to_scan_treadmill_at_planet_fitness.pdf
    • https://uploads.strikinglycdn.com/files/3d3e48eb-5fb0-4bcb-8dff-6a9ebfadd441/dotnet_interview_questions_for_freshers.pdf
    • https://s3.amazonaws.com/wapabefizosumi/expanded_noun_phrases_worksheet_year_5.pdf
    • https://uploads.strikinglycdn.com/files/60c29520-ca6c-4b66-ac68-4a8d4cc89bbd/jizerago.pdf
    • https://s3.amazonaws.com/vukumesoj/14056035959.pdf
    • https://uploads.strikinglycdn.com/files/d9dc704c-68a8-4f20-9f25-812a1e8517f9/wanito.pdf
    • https://467375c7-a7a6-4806-a9b7-892c2a528f89.filesusr.com/ugd/911174_f2c0f266875848d8afea9090847f7393.pdf?index=true
    • https://926fca10-1439-4adc-b819-38dad5327275.filesusr.com/ugd/26d6d3_72c47624687442a5974689c0f225d315.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4b039e67-b5fb-41ec-97d8-1fec36eb7d5b/noxulaleviwumuvefa.pdf
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_358277c0c2294d2cb7718a2abc7dd7cc.pdf?index=true
    • http://gidozowelixije.rf.gd/brokeback_mountain_download.pdf
    • https://uploads.strikinglycdn.com/files/09c151b6-02c9-481d-be81-c87864d41d97/black_and_decker_leaf_hog_240_mph_blower_vac.pdf
    • https://uploads.strikinglycdn.com/files/4d9c2d85-9f44-42c7-a7b8-df480cebe73b/rolenudonupusowegazuvale.pdf
    • http://dalezogidaxi.epizy.com/tutorial_point_python.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_off00010f51.bin
e1e00a1cc2acc0e8abf15ed56d340e127dbe918ff1f3214a99d41fbf2e4ad860		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F51 5064 bytes
font_01_sfnt_off00012093.bin
15aa2032595d552724dd89f468643df227f1a04f513d0aade54631c6a98b58fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12093 11740 bytes

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