Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5cbc90879aa0e8d…

MALICIOUS

PDF

72.2 KB Created: 2021-03-24 13:59:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: e13146a5d4ecb04c9dde9ca85bd4a820 SHA-1: 6cccb14b7012c76268fbd591d25912cacebafab0 SHA-256: b5cbc90879aa0e8dc664946138f70635a86da12c2d9866767922af3d381dd624
134 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to deceive users. The presence of numerous external URIs, many hosted on disposable domains, strongly suggests a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true malicious intent through a large number of redirecting links.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=club+treasurer+report+sample PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447641/normal_602d2c46214d8.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/11935878561.pdfIn PDF document text
    • http://gamukanemafutu.mywebcommunity.org/how_does_migration_and_cultural_diffusion_work_together.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447108/normal_5fdc3a0d839c3.pdfIn PDF document text
    • http://vajukadezazi.getenjoyment.net/7293509027.pdfIn PDF document text
    • http://mugipojezekegul.iblogger.org/nipujosaf.pdfIn PDF document text
    • https://xogepojofaridel.weebly.com/uploads/1/3/2/7/132741214/nerifisukim-pegelokeruk-marazipodopudox-lilunamil.pdfIn PDF document text
    • https://wemezixogasowed.weebly.com/uploads/1/3/1/6/131637562/jiwagupenis_lumapelukajixap_sagumewi_vizovetotan.pdfIn PDF document text
    • https://rigonabex.weebly.com/uploads/1/3/1/4/131483185/a076046461b97.pdfIn PDF document text
    • http://rezumitisud.mygamesonline.org/dizowakutovagor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417528/normal_5feb07a84a2be.pdfIn PDF document text
    • http://zovolexune.sportsontheweb.net/difference_between_contract_and_agreement.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403120/normal_6056e952eda76.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366339/normal_5ff1f3d890259.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nununad.myartsonline.com/23030613245.pdfIn PDF document text
    • http://jatuxijor.epizy.com/50735669332.pdfIn PDF document text
    • http://rapuzivawa.epizy.com/sumunuvoxuboluwijilitoso.pdfIn PDF document text
    • http://loxeputogojew.rf.gd/61465178603.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_off0000dd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1E 5012 bytes
SHA-256: 12ad92efbfcf960b7df663173aa727a2dbee0ce48032987ccac3c95bd66d7f97
font_01_sfnt_off0000ee03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE03 11044 bytes
SHA-256: 28cef6a426917541c4da8afa5994ba8777649135f933425d63fc2d79e494d6c6

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