Malicious PDF — malware analysis report

Static analysis result for SHA-256 50743b11e1ed5f8f…

MALICIOUS

PDF

91.7 KB Created: 2021-05-27 20:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 412b90bf9896b17127876c1bddb62ecd SHA-1: 63366683b7a6135a2ea0e74884273b93c8d4f0f9 SHA-256: 50743b11e1ed5f8fdec56f2b748aee0590e80282a2d57dc59ea1832d7d1bddeb
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs are likely used to redirect users to phishing sites or download further malicious content.

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://xajibur.ru/strik?utm_term=correct+conventions+and+degree+of+formality PDF link annotation
    • https://zemuxarasojutin.weebly.com/uploads/1/3/4/3/134374283/0b993fdde83d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494417/normal_5fff069fd5bae.pdfIn PDF document text
    • https://miwidikanizi.weebly.com/uploads/1/3/4/0/134016908/6619947.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405194/normal_605a374ef3803.pdfIn PDF document text
    • https://metolokinazez.weebly.com/uploads/1/3/1/4/131452743/7528488.pdfIn PDF document text
    • https://bupudotededifo.weebly.com/uploads/1/3/5/3/135323991/dipenazuleromajadabe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4ba3fe91-e0af-45f2-9a3e-597172ebaff2/29169440965.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd52f837-d27d-4803-93dd-057b0d7113ca/die_kleine_raupe_nimmersatt_inhaltsangabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67eb6716-e2f6-46aa-89e8-d53fd131ec1e/free_ekg_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/913454f7-729c-4739-a931-17769ca0b44b/xogujati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8378b50-4566-4c62-a9e4-d6696e652b8f/gamegorelabutine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd07b413-24b5-428e-9351-e39450a1aa4e/letanias_del_rosario_a_la_virgen_maria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9f4c705-8a0a-4ddc-8dd3-f6cce9465104/wubatarivap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06d1af50-c6aa-4958-89bf-9fde4e06e9e1/24354582327.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aacf49cf-2036-491e-8fd9-94aa83224b00/20937618561.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/613529c4-da5f-4405-b56e-3dace30df7a6/27170989791.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80b8254d-dc87-49ee-bd84-6aed4f544b68/davelomigivatuzoranide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c81512a3-c1c3-4ae7-adea-07f9684cfa61/rowew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38f4adff-f849-4889-8db9-c089b5ab7039/curso_de_sistema_electrico_de_motos.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEC 5312 bytes
SHA-256: 9d9306fb0c2eacb85d843aa9764adba775dc75ebfc2f688e53b88d5c0492863e
font_01_sfnt_off00012de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE8 10964 bytes
SHA-256: 7964a8ef5526c7c52340e04271ac5ffedcf9f75bb215f539d8800965e4ca73e2
font_02_sfnt_off00015331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15331 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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