Malicious PDF — malware analysis report

Static analysis result for SHA-256 de58c4714e90f643…

MALICIOUS

PDF

73.5 KB Created: 2021-01-04 00:36:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 90f0259eaa78ccc0c54fbcc36b97da3c SHA-1: c355e987eaf022633a27d3e0cc5dd4b26e671032 SHA-256: de58c4714e90f643a3758c77a4e7922b8e4483d25c54ab31d53abfc3541f65ae
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a domain associated with search engine optimization and potentially malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to drive traffic to other sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://trafficel.ru/aws?utm_term=batman+the+killing+joke+1988+pdf PDF link annotation
    • https://mesirurot.weebly.com/uploads/1/3/4/7/134706751/6383f4a2ab04e.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/desedegi.pdfIn PDF document text
    • https://cdn.sqhk.co/rolekixawute/ciahhha/14894721706.pdfIn PDF document text
    • https://sunajekivogemaz.weebly.com/uploads/1/3/4/8/134895881/solosapogabage_pijig_sewoxokugi_vuwadajis.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/2c029f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/da46b243-c480-46d3-8fa7-6d88d9322505/47297264514.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e58a49f-51d2-4be3-b7f8-61a080e6bf2d/43876625231.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/929afdf9-8d94-44a3-8188-4f60395511c3/91675992075.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21cbd0c3-e0a3-4fe7-a8eb-9939ec7024fc/xarufiponosoxusiwalik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af050048-46e5-4528-9ce1-9bbe92cb348e/256_area_code_current_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5525d24-5387-447a-b9f1-26011ca4632b/latin_derivatives_in_spanish.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/cambridge_english_starters_9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfc8322f-6074-4806-8007-95db708edbdf/steam_wallet_code_free_no_survey_no_password.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/asking_for_permission_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb8aef0d-087b-468a-8afe-5dc6c489e0c0/citrix_receiver_4.3_download.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_off0000e10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10F 5772 bytes
SHA-256: 4b31f39a056ac87aed214d6c9a41e4455458d8e947679a3f104a4d2612423537
font_01_sfnt_off0000f4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A7 10496 bytes
SHA-256: df9b06f309f3c670659b2eb45d59ab4c9f8f30d0f2a1e8c25ea1fca33a8d7a7c

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