Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed7a668ba48cac9e…

MALICIOUS

PDF

78.2 KB Created: 2021-03-14 04:43:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f5f1f38e7de5438a614c2c5b06b8202d SHA-1: f01db6ee5554235d1b3a87d0769028a7512c481e SHA-256: ed7a668ba48cac9eac1c5e3fca1eada31ca8ca8533c4637907cfcfaa4cc35a61
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 are embedded within what appears to be SEO-optimized content, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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=what+is+the+best+way+to+transport+a+grandfather+clock PDF link annotation
    • https://xonuguzuv.weebly.com/uploads/1/3/1/3/131382030/mijatafudibeno.pdfIn PDF document text
    • https://kafaxidaduxeb.weebly.com/uploads/1/3/1/4/131438036/526a657155ce5.pdfIn PDF document text
    • https://palisuxil.weebly.com/uploads/1/3/1/0/131071308/839f4f7.pdfIn PDF document text
    • https://degusatujetuz.weebly.com/uploads/1/3/0/8/130813325/7695343.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/jesukaxafositururoku.pdfIn PDF document text
    • http://wasatosu.sportsontheweb.net/annotation_examples_for_students.pdfIn PDF document text
    • https://cdn.sqhk.co/puxezuxivas/iNieyie/occupational_therapy_salary_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/rudolikube/PSgi2gg/79707438475.pdfIn PDF document text
    • https://vejikawotepux.weebly.com/uploads/1/3/4/8/134887167/raporijefuzisovurozo.pdfIn PDF document text
    • http://sepukolobu.sportsontheweb.net/diseo_arquitectonico_definicion.pdfIn PDF document text
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/nesetuxodapej_koxefu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_8c2213255fd7482184f302e0d75b29e6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/67987783905.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/79849924363.pdfIn PDF document text
    • https://510b81f6-be4e-4e40-9acf-3f60af495837.filesusr.com/ugd/5f226b_c058cf989f574eeb86e780dd42f9c6fc.pdf?index=trueIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_9d4f2cad29cf4477b8c9914135001afd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/64268241247.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/android_games_rpg_offline_free.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/citation_style_guide_examples.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_off0000f2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FA 5828 bytes
SHA-256: 1f066de805747c0bf8945797b9aba50eaef6a45cda693b6fd36997f84bcae59b
font_01_sfnt_off000106ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EA 10736 bytes
SHA-256: 5ff07e8ca069eca9d56c3302ae77a891da32f3fc662076bf06fe8b6533572df6

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