Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13d7765c5768734…

MALICIOUS

PDF

80.0 KB Created: 2021-05-20 18:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6a990009c33c03d7bea4802947ee9640 SHA-1: 2659c5b64f1f5d0865eba685cc2be7ec9d55078a SHA-256: f13d7765c5768734ac9c185d2d31d9b6fc461e018595cff17cc9568439634e65
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical detection for a link farm and a high ML score. It contains numerous external links, many hosted on Weebly, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports the lure-based attack pattern. Although no scripts were explicitly extracted, the PDF structure and link farm indicate it's designed to redirect users to malicious sites.

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.
  • 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://kuzutuzo.ru/strik?utm_term=trio+of+towns+vs+story+of+seasons PDF link annotation
    • https://wufaxewixebel.weebly.com/uploads/1/3/5/3/135302410/bomiwilotupafim-guropopazu-forupitutolibev-lipogexufakul.pdfIn PDF document text
    • https://devojakosumu.weebly.com/uploads/1/3/5/3/135314674/ruzokiwa-kepedosawonegod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381988/normal_604fa8e1ead0b.pdfIn PDF document text
    • https://kotuposa.weebly.com/uploads/1/3/1/4/131406283/tutakufipujapo.pdfIn PDF document text
    • https://ginugifugebiner.weebly.com/uploads/1/3/4/2/134234672/c96dffc00d6b2c.pdfIn PDF document text
    • https://valiwuvubeke.weebly.com/uploads/1/3/4/6/134694219/99217d9655009.pdfIn PDF document text
    • https://vorenamu.weebly.com/uploads/1/3/4/2/134265490/bozoxodegokivu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491164/normal_6064579455177.pdfIn PDF document text
    • https://dotawipe.weebly.com/uploads/1/3/5/3/135323210/598b97d9f2ce.pdfIn PDF document text
    • https://rixadoliwuri.weebly.com/uploads/1/3/1/4/131437780/4128454.pdfIn PDF document text
    • https://gogovujogizog.weebly.com/uploads/1/3/1/6/131607278/3036168.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388177/normal_604ca1e32ff98.pdfIn PDF document text
    • https://ledejikijosud.weebly.com/uploads/1/3/1/6/131607919/3627730509622.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/fixararololu/firazu.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/famikemap.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/auditing_and_assurance_services_16th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/99840019516.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/codycross_answers_group_4.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/how_to_find_your_passion_worksheet.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_off0000fb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB59 4932 bytes
SHA-256: 12e72fe305f59664209bc5ccf0bdbef99d8ecfd84ae65dc420ad048d4334d86c
font_01_sfnt_off00010c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4D 11176 bytes
SHA-256: 70180c2fa3ecaaac758e3a458650e77d4b9fffa947743ff8f477ba5166e3df9c

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