Malicious PDF — malware analysis report

Static analysis result for SHA-256 f445781e8b6fb1db…

MALICIOUS

PDF

73.4 KB Created: 2021-03-12 13:14:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 7974b1c7c4cf44e798bc9f7bdeb3cf34 SHA-1: 12eb35e5af49d5188166c7a0e449c93cc3133b93 SHA-256: f445781e8b6fb1db7c8e0cff9084537d18449876ae422b0d2981184504924429
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for a link to known malicious redirector infrastructure. The document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 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.
  • 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/wix?keyword=router+guide+rail+adaptor In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369912/normal_6046a8c5e9e62.pdfIn PDF document text
    • http://uaregroup.com/area_and_perimeter_worksheets_free2oici.pdfIn PDF document text
    • http://pesale.pro/is_dan_brown_writing_a_new_book_after_originxhmao.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374953/normal_5fcbe332918da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411245/normal_5ff6539908d6a.pdfIn PDF document text
    • http://zanovekolasin.mywebcommunity.org/67620500792.pdfIn PDF document text
    • http://gupirigugorixuf.sportsontheweb.net/lost_islamic_history_in_urdu_book.pdfIn PDF document text
    • http://zogometemo.sportsontheweb.net/how_to_bend_pipe_by_hand.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390660/normal_6025a4df0e420.pdfIn PDF document text
    • http://copyrightviolationcenters.com/8_codewords_answers3f6zr.pdfIn PDF document text
    • http://macsk.space/columbian_exchange_worksheet_middle_schooldjf2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388432/normal_5ff925ab0efa9.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/kifutizijebuj/bed_bug_report_florida_hotels.pdfIn PDF document text
    • https://459fb65c-52af-4c88-885a-43a44fbeaf25.filesusr.com/ugd/6a7407_2b97483bb6684267b12474f3ebf53bb4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/money_tracker_excel_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/82935859420.pdfIn PDF document text
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_1861e9c5bfbe4c29b4d91e8759994c6c.pdf?index=trueIn PDF document text
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_aa710f27babe4b2c9eaff0f13a9b9f07.pdf?index=trueIn PDF document text
    • http://bejanifezilo.atwebpages.com/mmpi-2_test_free_online.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/adharam_movie_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/29389781211.pdfIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_ece2ec181ada4c5b89629c973245a850.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/jofawaledu.pdfIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_ed2289913d6c494db67c8ff8a5691899.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/farowug/awk_format_leading_zeros.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/lurilorek.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_off0000e433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE433 4956 bytes
SHA-256: dbcffa738774197066a77ddf7568e610ae3af4bd3da22b84aab57830b8137be3
font_01_sfnt_off0000f524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF524 10268 bytes
SHA-256: 021f53ed749167107ae6c40d8e2a0e3e634a2b688357bd1f73c3dd1da45a60a9