Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9e41e23e3ff29e…

MALICIOUS

PDF

74.9 KB Created: 2021-04-18 19:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 059ad14b43db5aaef71ed7ec052d8722 SHA-1: 22b5dc55e1164795d68d049e4cdeff3fcbb29939 SHA-256: 5b9e41e23e3ff29e13857e24d016c1f9b55a39b3dae30c420b6c539e8535a516
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=how+to+check+amp+draw+on+ac+compressor PDF link annotation
    • http://smirno.life/panasonic_microwave_oven_nn-sn766s_manual4280z.pdfIn PDF document text
    • http://wekeb.space/302118949243zyb7.pdfIn PDF document text
    • http://erogan-encolumbia.site/dovumulur8a937.pdfIn PDF document text
    • http://vuwimoxit.mygamesonline.org/precalculus_fifth_edition_mathematics_for_calculus.pdfIn PDF document text
    • https://cdn.sqhk.co/geruxibab/2mggjae/foxasosesodaj.pdfIn PDF document text
    • https://cdn.sqhk.co/nunemiziku/YD1dSXZ/jibed.pdfIn PDF document text
    • http://raxawevamavox.getenjoyment.net/are_delonghi_and_krups_the_same_company.pdfIn PDF document text
    • https://cdn.sqhk.co/vimerokil/gFSzlyW/smart_tv_file_manager_apk_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/34532288-fe85-4cf8-91dc-5d065633d5b8/notofivudizakigorozo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b35a5df7-cb77-4d9c-a097-57fc52c1e725/kuzepux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec8245d8-9fcf-40aa-b302-6d9126828333/what_is_the_best_time_to_recite_surah_mulk.pdfIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/things_wrong_with_american_girl_dolls_look_like.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55297485-de4a-4489-ac88-1e20200bdb75/heat_exchanger_design_handbook_hewitt.pdfIn PDF document text
    • http://femagela.myartsonline.com/creo_parametric_3._0_assembly_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/vegubatu.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/gakazijipiruna.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/11689352514.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4670b123-aa1a-412f-8c61-c6f214be164f/the_7_basic_human_needs_that_successful_businesses_focus_on.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/8534925254.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_off0000e8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DE 5400 bytes
SHA-256: 0f319e31aecec95171ea1f7e3452c6af69605d359b988ffaf04656db7e113335
font_01_sfnt_off0000fb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB18 10300 bytes
SHA-256: 14c98665845addc45021f0cdc75707a545c985f2b5980a5c17de88664f26d91b