Malicious PDF — malware analysis report

Static analysis result for SHA-256 1966cff078a69eb0…

MALICIOUS

PDF

77.3 KB Created: 2021-03-10 09:17:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a9ba1aa4829f7b917cca58b78d4f3e89 SHA-1: 923731e07fc29172f162b3d028566a0e872a4679 SHA-256: 1966cff078a69eb0816f3c5b7510ca521eef737aec8e6205e6aa6e113ebf4d39
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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
  • 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://nipisod.ru/strik?utm_term=which+software+for+logo+design PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4365642/normal_5fcf4abab3199.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406789/normal_5fc7e0a9bd359.pdfIn PDF document text
    • https://mewifukemi.weebly.com/uploads/1/3/4/7/134764424/3819021.pdfIn PDF document text
    • https://wawulawad.weebly.com/uploads/1/3/4/8/134872625/sikisavivobejikotem.pdfIn PDF document text
    • https://bonikelebosobi.weebly.com/uploads/1/3/2/8/132814552/3630629.pdfIn PDF document text
    • https://mepifinifiwiza.weebly.com/uploads/1/3/4/3/134334375/6732465.pdfIn PDF document text
    • http://woxuruko.medianewsonline.com/synonyms_and_antonyms_worksheets_for_3rd_graders.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426823/normal_5fdfff173b13d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448719/normal_5fd21d26f1a6c.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/figidireki/6678387065.pdfIn PDF document text
    • http://gemawinikifiv.myartsonline.com/40048204731.pdfIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_f25bea3ca9ff46768c12ceb6cccfca73.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/zuxozabaxemijikulejov.pdfIn PDF document text
    • http://dewelimu.epizy.com/tamilrockers_2009_tamil_dubbed_movies.pdfIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_31ce77f95a7b41419b23b9c012f281f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jifesu/18060014768.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/chilis_menu_mexico.pdfIn PDF document text
    • http://xelilurezo.epizy.com/whatsapp_plus_new_version_free.pdfIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_9f5cf17f5bb045029e87cdb658ccd99b.pdf?index=trueIn PDF document text
    • http://pukafenofi.epizy.com/kuzejewunajewe.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/circular_saw_guide_system_lowes.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_off0000f101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF101 5388 bytes
SHA-256: 6bba91c4b59b125a017afacf2f3c48eaa730f4db4103ce2a83edd6180d0b00f8
font_01_sfnt_off0001036c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036C 10716 bytes
SHA-256: 4732a9604e6ce94e737bfe4bb6f6a7ac0c71921d43b82d8ac0740f61cc976f01

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