Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f52acf9d037911d…

MALICIOUS

PDF

77.1 KB Created: 2021-04-24 22:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b8e82c57f2968c0d4f72ea32ec0315dc SHA-1: 4c64fd9eb1416131db4904b56b9ea697db99937d SHA-256: 4f52acf9d037911d4dc7f82b32bd43030cdf7e452b8507e2a6096efab31ee283
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link to a known malicious redirector, indicating a phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a payload or lead the user to a credential harvesting page. The embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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.
  • 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://dafemum.ru/strik?utm_term=how+to+register+network+in+samsung+j7 In PDF document text
    • https://cdn.sqhk.co/rorezina/egbHhcm/1388189067.pdfIn PDF document text
    • https://cdn.sqhk.co/gepumenujeme/i4jfgc9/21_cfr_date_format.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/the_gregorian_calendar_replaced_the_julian_calendar_in_great_britain_in_which_year.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379856/normal_601cceafa9acb.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/ictsjd3/pixel_running_out_of_space.pdfIn PDF document text
    • https://cdn.sqhk.co/dobajinorite/X7jeMTr/gusipazugo.pdfIn PDF document text
    • https://cdn.sqhk.co/fegukajebaj/giligGY/toman_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/subesanodag/ihgfR3O/rc_car_race_track_accessories.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/0hgdZPj/kanto_power_collection_release_date.pdfIn PDF document text
    • http://sonasutos.mywebcommunity.org/detailed_project_report_sample.pdfIn PDF document text
    • https://cdn.sqhk.co/nobutowug/imjaYhe/escape_the_bomb_manual.pdfIn PDF document text
    • http://kovamuwaropepu.getenjoyment.net/how_to_format_a_research_paper_chicago_style.pdfIn PDF document text
    • https://cdn.sqhk.co/jozojijejip/lgdpAgh/48515483332.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425507/normal_602937614976c.pdfIn PDF document text
    • http://sijemogezabusa.sportsontheweb.net/what_is_a_computer_science_degree_used_for.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447087/normal_605952ddedd5b.pdfIn PDF document text
    • https://cdn.sqhk.co/wareberefiz/ighYYje/pixel_maker_download_free.pdfIn PDF document text
    • https://cdn.sqhk.co/nexasolonit/Jggbtgd/digestive_system_facts_and_functions.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/9f160729-47f5-45f6-b7ca-835f9f271fd8/da_de_la_cruz_roja_del_10_de_noviembre.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23776525-3fac-4e20-b8fb-f517bb214fca/posepabovunorelazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0be2b695-8760-4689-a82c-5398f46bce2a/jegimipotaloperi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a23c0c52-aa45-4923-8354-cefa36670135/loxusitivaneg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f15077b-bdba-4859-8cef-6dea222f1e91/enron_scandal_case_study.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_off0000eeed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEED 5244 bytes
SHA-256: 86c1b688008e4e6021bf18112773ebf3d88deee3f6e12bea6b58b65d2ea1a3c1
font_01_sfnt_off000100cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CF 11156 bytes
SHA-256: 7def0d5a6ac869e96d4b58371cce75e3ae2d6a997a386a1049b87966fbc8d190

Open this report in the interactive analyzer, or submit your own file for analysis.