Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3f1e5a7d5919db…

MALICIOUS

PDF

90.3 KB Created: 2021-02-28 10:48:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c0c7e3305c61bb590aea56112d0dee6c SHA-1: 8df3e76dcfd2a92a7f9debb469351d194885bc6c SHA-256: da3f1e5a7d5919db9032cee9b6482cd3579b5bf75bff6b97875252d0e3384964
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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://leonvi.ru/wix?keyword=reader+rabbit+1st+grade+credits PDF link annotation
    • http://xorabawik.medianewsonline.com/can_you_have_a_cdl_and_a_medical_card.pdfIn PDF document text
    • http://rolapisi.scienceontheweb.net/36412741206.pdfIn PDF document text
    • http://mifukuvij.iblogger.org/93342093694.pdfIn PDF document text
    • http://zatoxuvisovapuf.sportsontheweb.net/51701958922.pdfIn PDF document text
    • http://josumewemuzob.getenjoyment.net/scout_and_guide_book_in_hindi_free_download.pdfIn PDF document text
    • http://kagaromorin.medianewsonline.com/how_to_reset_ink_level.pdfIn PDF document text
    • http://pakamid.22web.org/62218616520.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/9909448038.pdfIn PDF document text
    • http://mebovedu.getenjoyment.net/wemuzefuvokizozugijofus.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/the_age_of_sustainable_development_summary.pdfIn PDF document text
    • http://vanimerukaguto.scienceontheweb.net/how_to_change_the_date_on_a_citizen_eco_drive_watch.pdfIn PDF document text
    • http://manoligixave.66ghz.com/63400927327.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/mini_dv_camcorders_for_sale_uk.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/deriluduxobogu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479439/normal_5ff760c96aa89.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zozusanom.epizy.com/wave_tom_jobim_sheet_music.pdfIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/97376677710.pdfIn PDF document text
    • http://lenadupubop.rf.gd/42101208294.pdfIn PDF document text
    • http://xekabotiwuker.atwebpages.com/vajuwakagurerabumojek.pdfIn PDF document text
    • http://rugaroli.epizy.com/budgeting_for_students.pdfIn PDF document text
    • http://nojikigor.myartsonline.com/10840286650.pdfIn PDF document text
    • http://tolimimagag.epizy.com/cyber_security_powerpoint_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001130f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130F 4852 bytes
SHA-256: 455a92749bd8ac868e5973fa2e3cb78726229369497c04e0fcca92b1fac814b0
font_01_sfnt_off000123f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F2 5276 bytes
SHA-256: 7ad258472e62640d46700a9bd6ee5a2d71991cffdf7684cafe657c5f6ae6affc
font_02_sfnt_off000135f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F8 10868 bytes
SHA-256: 1488dfee4742876ede52541712257b00e9ed691f2e8ee90b76871cb87489c5c0