Malicious PDF — malware analysis report

Static analysis result for SHA-256 5549fb1e747024a5…

MALICIOUS

PDF

91.6 KB Created: 2021-03-21 08:13:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 431d4d1b19d1d18aa6e1e2860e835366 SHA-1: 2a2b8907ebf5d9ea04dda1626933abc7dc8003d0 SHA-256: 5549fb1e747024a54e18ef377c0d1b8457af1461e2e53e6237437e662fd8406a
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating it is part of a link farm, with one external URI pointing to 'https://seumenha.ru/strik?utm_term=basic+english+worksheets+for+grade+1+cbse'. Although no scripts were explicitly extracted, the presence of embedded URLs and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly suggest malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=basic+english+worksheets+for+grade+1+cbse PDF link annotation
    • http://zarepaputome.iblogger.org/55739656221.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/netinuwa/cronicas_de_una_muerte_anunciada_personajes_principales_y_secundarios_descripcion.pdfIn PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_a7b13a04616b4926b5eb47a9bc9e7758.pdf?index=trueIn PDF document text
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_9ae259654d154cf0863aeb2a8f6c6e38.pdf?index=trueIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_0c2ae85e01414bd5892ba116b60a296a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/benuka/verizon_mi424wr_password_reset.pdfIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_9fd2b8a101b84e459187ac9566be1321.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/satudifin/halloween_pumpkin_faces_templates.pdfIn PDF document text
    • https://db38eef3-7d65-43a4-badd-ba39ed7d9417.filesusr.com/ugd/bd2483_956a364b71b24fa98813a56d67076781.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zikeko/sasizotibegadukiwidiz.pdfIn PDF document text
    • http://rutotonofawe.rf.gd/duvirupadenaka.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/black_color_wallpapers.pdfIn PDF document text
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_0e5ce3a4b0484a9b966b29f9e175a444.pdf?index=trueIn PDF document text
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_d51e07bc44d1415bbd6387955deb0d5b.pdf?index=trueIn PDF document text
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_befeef22a454499da82c5f8fabb0a727.pdf?index=trueIn PDF document text
    • https://1527c8d3-3321-4e9f-872f-e2bebb57bac2.filesusr.com/ugd/bf2d42_c71290f3e50d4bc78e2129235ddca1ad.pdf?index=trueIn PDF document text
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_7806dc436a194a389ec14ff8ec5712e6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/tikelaxelole.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/24444426143.pdfIn PDF document text
    • https://7c3a386c-9197-44ff-a2a0-26a6be1b6260.filesusr.com/ugd/bba797_8d9095d290fd4ed78066d9f032356da1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/meludav/waste_management_business_plan_in_india.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_off00012542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12542 5680 bytes
SHA-256: 3e6903a90779de236523773f0344e6fb67b2b2b8560a4a5941125c538c71a01f
font_01_sfnt_off000138a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A3 11668 bytes
SHA-256: 161e4d1c87a0d0c00b2f0e2c6df9df8c32c9c79d09c3df682537c3f845d27bda

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