Malicious PDF — malware analysis report

Static analysis result for SHA-256 672b98f093d8b490…

MALICIOUS

PDF

75.1 KB Created: 2021-06-04 10:40:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e36f79b02bf028f2036c4ae3985a5c1b SHA-1: eeddfe7fc6b513eeb436f44224a15a281585ea7f SHA-256: 672b98f093d8b4901c91592a8bc415e65a4177503e0e535f205ed6c12e5bf4d5
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a redirector to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous links suggests an attempt to direct the user to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=ipcc+5th+report+upsc In PDF document text
    • https://vififeroxesazu.weebly.com/uploads/1/3/4/7/134737415/1873469.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416490/normal_603fd081e8e18.pdfIn PDF document text
    • https://gofazawadatefit.weebly.com/uploads/1/3/5/3/135349405/saxujuneluwu_budabuliv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444657/normal_6041cb8cb579f.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4485823/normal_60b207f1d94bc.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4374521/normal_60b19e68485fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366646/normal_6025b4d887d4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448103/normal_6037c1c55e7f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369160/normal_5fd3dd208a1ff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ronefete.pbworks.com/f/formato_para_seguimiento_de_visitas_a_clientes.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/primavera_silenciosa_resumen_por_captulos.pdfIn PDF document text
    • http://kigemulu.pbworks.com/w/file/fetch/144547707/15602055611.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffe9ac23-7b85-4039-a498-cc3cf69f1471/script_writing_format_in_hindi.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/f/kiss_me_2011_full_movie_watch_online.pdfIn PDF document text
    • http://bujolajoxek.pbworks.com/w/file/fetch/144582783/quiero_saber_cual_es_mi_nahual_maya.pdfIn PDF document text
    • http://xodelow.pbworks.com/f/zabinokiporoxulo.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/f/famakasuvotodibolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4878e869-3ff3-4407-97ae-b044c2e22644/adobe_illustrator_cs6_serial_number_validation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3847eda1-37e9-4b45-a468-fc8b1c44cda0/remington_700_sps_270_review.pdfIn PDF document text
    • http://pudamalulera.pbworks.com/f/free_download_car_racing_games_for_pc_windows_7_offline.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_off0000ea49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA49 4840 bytes
SHA-256: c6a88df5aac0136fe4530defb5862c7174b2912b064e0b00c75f0fc5b5f02682
font_01_sfnt_off0000fac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC1 10272 bytes
SHA-256: 00431e7a8217c9fd6067427c9c77b94c3bce0285c9ad257cba37ffe773b382fe