Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eca5468da89bf7b…

MALICIOUS

PDF

127.3 KB Created: 2021-04-09 19:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fdd504784e01eeddef95d637c94b94a SHA-1: 1ce087809c5cda998d6fa9022d6adcf37373808a SHA-256: 8eca5468da89bf7b4a937273446ea87ba1bfac579f50385bf3550bffbbac0f06
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 to PDF documents, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=what+is+integrity+in+sport
    • https://cdn-cms.f-static.net/uploads/4404113/normal_6050dc9c21ab5.pdf
    • https://cdn-cms.f-static.net/uploads/4368227/normal_60186232d3801.pdf
    • https://ligibodi.weebly.com/uploads/1/3/4/4/134469997/2d82a5321bfb0.pdf
    • https://lovebaxubifutu.weebly.com/uploads/1/3/4/3/134322000/xebipupa.pdf
    • https://cdn-cms.f-static.net/uploads/4487191/normal_603f98e6a6b96.pdf
    • https://cdn-cms.f-static.net/uploads/4498678/normal_606b294e02a73.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_1852d05914b845a4abc6ecb221ce8021.pdf?index=true
    • https://c140f178-ee45-427e-91fe-a3c5f821f67e.filesusr.com/ugd/ebc5f9_c8597a7d0c1446ca8b94d6de814d3fef.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f62de33c-8bc7-412a-9c50-a9f8eb58ff56/cuanto_son_600_gramos_en_tazas.pdf
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_d7ce4486fbdc4883a611a5ea3a112216.pdf?index=true
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_4bedda7b042a4801860bcdd06f6b6056.pdf?index=true
    • https://uploads.strikinglycdn.com/files/34595e14-a44a-4adf-9b30-8ba7db519cb1/vaxirineji.pdf
    • https://d1b6b380-f15b-462b-86b5-0b089ba7d90d.filesusr.com/ugd/f99a33_cab932670d8a4fb38dc8f5b2ca85d296.pdf?index=true
    • https://e082cb0d-9c22-4a21-acb7-e2c6127a51d3.filesusr.com/ugd/ff0c06_cdad2d08412d4dac9faf00ccaa1684c0.pdf?index=true
    • https://s3.amazonaws.com/mubefula/what_to_look_for_when_buying_a_second_hand_car_uk.pdf
    • https://s3.amazonaws.com/risisipajole/regobu.pdf
    • https://s3.amazonaws.com/nafamaragisek/zeminigabasopasogixubo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b6d3.bin
f5f2934314027ba9bd85e4a17ff512c5cc1962b9638e65cc993888d48accde6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6D3 5164 bytes
font_01_sfnt_off0001c871.bin
b89c73a92a39c5f8484c6c1baa6c71d3483302e2a4362c6a296fe2a20a99b657		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C871 11640 bytes

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