Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f9c3977e75d25c…

MALICIOUS

PDF

72.5 KB Created: 2021-02-25 08:03:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: dd10ef5ccf182a66c301aad6e0a956f4 SHA-1: 3eb62b081d45059872046d62f693d46adb6407cf SHA-256: a1f9c3977e75d25c2a911ec1008a19667ef41080be014c02c41053457c91d2e6
184 Risk Score

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
  • 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/wix?keyword=teacher+about+me+letter In PDF document text
    • https://cdn.sqhk.co/nulaliki/Rq2hhij/instagram_story_viewer_list_greyed_out.pdfIn PDF document text
    • http://pedumerik.sportsontheweb.net/how_to_start_a_fiction_short_story.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473410/normal_5fcf5ccbb89bc.pdfIn PDF document text
    • http://lizoguxumugef.mywebcommunity.org/eureka_forbes_vacuum_cleaner_service_centre_in_coimbatore.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377403/normal_5fc80f32ddec0.pdfIn PDF document text
    • https://cdn.sqhk.co/rexadiwixox/zJkjihh/58832915285.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/zejaki.pdfIn PDF document text
    • http://katipef.medianewsonline.com/33751426198.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/98257108236.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454546/normal_5fd2c87b88ab4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368788/normal_6020b71eb6c29.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/simujix/analysis_of_panel_data_hsiao.pdfIn PDF document text
    • http://zuputes.atwebpages.com/skyjack_3219_for_sale.pdfIn PDF document text
    • http://sanobinam.rf.gd/cmhc_mortgage_lending_guidelines.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_off0000e193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE193 4948 bytes
SHA-256: 66b2373b0c79a58f68e4207a39d5b1095378c54a28c99a72e4f7095436b10dc4
font_01_sfnt_off0000f23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23A 10184 bytes
SHA-256: a82e80834ad4c2ef854520f41cdebf669a0223ebfcc329c1bd487d5ecc84b052