Malicious PDF — malware analysis report

Static analysis result for SHA-256 7109d47f50b1f6f2…

MALICIOUS

PDF

76.4 KB Created: 2021-03-09 00:00:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 09848644b787a84b44436ad7145c852a SHA-1: 00e214c3f9ac146b55d751622952b2f93ad7eb42 SHA-256: 7109d47f50b1f6f2cc32bc108ccd86bcb41c2fc0abf13fbe2165ac8820b88efd
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The embedded URL 'https://zajinet.ru/wb?keyword=v%20shred%20weight%20loss%20quiz' likely serves as the initial lure for the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://zajinet.ru/wb?keyword=v%20shred%20weight%20loss%20quiz PDF link annotation
    • http://didavixakodix.22web.org/fisivurasijolidevatefuz.pdfIn PDF document text
    • http://pivolirarorip.mypressonline.com/jimiwozef.pdfIn PDF document text
    • https://sosatiga.weebly.com/uploads/1/3/1/1/131164398/nalajod_xuramulof_gutipefimero_duxaz.pdfIn PDF document text
    • https://nugijokokul.weebly.com/uploads/1/3/0/9/130969158/wejikoxetilonexugom.pdfIn PDF document text
    • https://solupufaposedi.weebly.com/uploads/1/3/1/8/131857421/8614502.pdfIn PDF document text
    • http://triple-doska6.club/business_law_book_semester_1rxqwg.pdfIn PDF document text
    • http://topsalon.xyz/the_cask_of_amontillado_audio_mp38w2jy.pdfIn PDF document text
    • https://pefipufipukota.weebly.com/uploads/1/3/4/0/134042651/noxarunir.pdfIn PDF document text
    • http://blockingscenery.com/practice_11-2_surface_areas_of_prisms_and_cylinders_worksheet_answers0itsh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://25f35837-e8ad-4357-b490-8f69bec4165a.filesusr.com/ugd/96c61c_5b37776cc42248f38e37bc3127de9d74.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/27672434452.pdfIn PDF document text
    • http://dejedizanabi.epizy.com/kobogigironep.pdfIn PDF document text
    • http://xodenumaverap.epizy.com/4838977665.pdfIn PDF document text
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_59d21f95f7494ca9b8255bea8d2543b8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/share_google_calendar_with_others_android.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/99677357402.pdfIn PDF document text
    • https://45b0b119-5f8c-43e7-b437-4e12d17c1c81.filesusr.com/ugd/3826db_a89fc4b140844f47bba6d4b26d8faca3.pdf?index=trueIn 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_off0000ee90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE90 5108 bytes
SHA-256: 7b3365b87c4c31b2279917529efd4ad137cfae399b66270211a9ae88e9738192
font_01_sfnt_off00010001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10001 10356 bytes
SHA-256: 00313f3976a434feb6ba02a70cdec20e3e20fd8dc455e62ad0448e03b5c539fa

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