Malicious PDF — malware analysis report

Static analysis result for SHA-256 d65dd3d36a9bcf80…

MALICIOUS

PDF

68.2 KB Created: 2021-03-31 23:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 256856f271082d08379fcd6d537336ad SHA-1: 280116b68163df11dc59f9f9066a94bca9de7786 SHA-256: d65dd3d36a9bcf80d9b46c7d371067959846e476ef050235fb87d45e4781e2bf
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, suggesting an attempt to drive traffic to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing campaign designed to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/wix?keyword=modesto+reservoir+directions
    • https://cdn-cms.f-static.net/uploads/4474980/normal_60233b3392214.pdf
    • https://cdn-cms.f-static.net/uploads/4421330/normal_5fe9a85d174bd.pdf
    • http://xagevogewa.medianewsonline.com/devi_bhagavatam.pdf
    • https://lixavoje.weebly.com/uploads/1/3/0/9/130969842/noduxepaxi.pdf
    • http://lorezagosuvese.scienceontheweb.net/64558014489.pdf
    • https://static.s123-cdn-static.com/uploads/4474456/normal_5ff7adb87eab0.pdf
    • http://wufamega.scienceontheweb.net/grimm_fairy_tales_movies_list.pdf
    • https://semanipiji.weebly.com/uploads/1/3/5/3/135312460/091db98487830b0.pdf
    • http://lumufurisazela.mywebcommunity.org/nokilubowaduzulorox.pdf
    • http://penageli.getenjoyment.net/psychology_mcq_questions.pdf
    • https://cdn-cms.f-static.net/uploads/4468286/normal_600ff84f78d1d.pdf
    • https://cdn-cms.f-static.net/uploads/4450251/normal_603a63b6aa65a.pdf
    • http://pofaduxiruk.getenjoyment.net/nixuzuxawowije.pdf
    • https://cdn-cms.f-static.net/uploads/4407983/normal_603bad80e8825.pdf
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/zuwes.pdf
    • https://gizafagubezuz.weebly.com/uploads/1/3/5/3/135321184/folavonifobap.pdf
    • http://lapivakop.getenjoyment.net/bhagavad_gita_in_english_download.pdf
    • https://cdn-cms.f-static.net/uploads/4401518/normal_5fdbc3527b1b8.pdf
    • https://cdn-cms.f-static.net/uploads/4367674/normal_603e453c2cfa7.pdf
    • http://desawigoxikugaw.mywebcommunity.org/advanced_statistical_methods_for_the_analysis_of_large_data_sets.pdf
    • https://cdn-cms.f-static.net/uploads/4455179/normal_5fe60ac660511.pdf
    • https://jevilorusijugif.weebly.com/uploads/1/3/0/8/130874204/596033.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000cecc.bin
c1eecd4b647150a308d66bc269329e7e87c7c1830fb6d802d2bde8eb12442e52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCECC 4756 bytes
font_01_sfnt_off0000df1d.bin
ca1680f9143c9746be8e9ac6047cb0b54b7b3e9396a80c21bfcf67c2a2d59ab8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1D 10628 bytes

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