Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd32c54d6d3631d…

MALICIOUS

PDF

75.9 KB Created: 2021-04-23 07:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c49b054570dc52419a68a1e12b126eab SHA-1: 258bea591bbabd91dc23bd15da3459d772a220e6 SHA-256: dfd32c54d6d3631ddca05c2827aca15b31e51ae9ccf4a43412a37c4ecb8f62ee
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/strik?utm_term=oracle+sql+to_date
    • http://vigikigopaloze.medianewsonline.com/cecil_textbook_of_medicine_25th_edition.pdf
    • https://bofonoge.weebly.com/uploads/1/3/5/3/135388944/somaxunido.pdf
    • http://doxulim.iblogger.org/burger_king_application_form_uk.pdf
    • https://tivufotevomok.weebly.com/uploads/1/3/2/6/132682035/5d96ecb89f111e.pdf
    • http://sutobep.getenjoyment.net/les_accents_cours.pdf
    • http://segikusi.22web.org/ipcc_report_august_2019.pdf
    • https://vaxofawaz.weebly.com/uploads/1/3/2/6/132682661/wolubutavuwowaf_memiwusosori_kijugut_wumeguku.pdf
    • https://bugebapujeze.weebly.com/uploads/1/3/1/6/131606260/tufonubolarovoku.pdf
    • http://nuzidixiwetor.22web.org/english_language_proficiency_test_sample.pdf
    • https://rarasuxa.weebly.com/uploads/1/3/1/3/131398432/vubuse_zuxerumup_tipagalaf.pdf
    • https://retevewaluwur.weebly.com/uploads/1/3/4/6/134600892/daburapajorolazu.pdf
    • https://fifurinirolegif.weebly.com/uploads/1/3/5/3/135306558/d5708686a9c51f.pdf
    • https://juvobekini.weebly.com/uploads/1/3/4/3/134384538/mexawaxetetive_titekafilimofug_limel_rerebipeb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_c1d8f41ddab34851882235ba77c45468.pdf?index=true
    • http://tenezozujilajiw.rf.gd/24794522081.pdf
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_a6e9d0d29ff24f6dbadf3ed9c89e3b38.pdf?index=true
    • https://0115c081-d8bc-4983-a705-81db93bf1442.filesusr.com/ugd/990402_55f77e43e3a44628af37efac44de0e94.pdf?index=true
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_64bdd09c865745f79c0cb727ba410390.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea0a.bin
864c52a55733ebf89dd4ded137d55f1ddf47c97ded5b8c124d37adbb42557327		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0A 5116 bytes
font_01_sfnt_off0000fb82.bin
df5ba841fb3e99202d8edb28d614771700526f66e0212b3bddbc169bf39c2f3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB82 11136 bytes

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