Malicious PDF — malware analysis report

Static analysis result for SHA-256 33afe430e1c0570a…

MALICIOUS

PDF

77.6 KB Created: 2020-12-30 07:48:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e5987757c8173f5c7c98317d273e8cb7 SHA-1: 721b9a3c1bf997e02a807a1ecacbf66b93985a3f SHA-256: 33afe430e1c0570a32f339fa1e1392c54c2e42cac98e061081bc0e28752e0ffe
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with the heuristic 'PDF_SEO_LINK_FARM' indicating a mass of 30 external links. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. While no scripts were directly extracted, the presence of embedded URLs and the link farm nature of the document point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/123?utm_term=major+scale+pattern+piano PDF link annotation
    • https://cdn.sqhk.co/pavetikedur/Ojehfhd/tiki_taka_barcelona_youtube.pdfIn PDF document text
    • https://soxigirotum.weebly.com/uploads/1/3/0/9/130969819/sanimezufora.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisuvov/b8Tl0ih/fivagibak.pdfIn PDF document text
    • https://kaginugopaz.weebly.com/uploads/1/3/4/3/134310825/zedetu-sanib-rifulif-zevupe.pdfIn PDF document text
    • https://cdn.sqhk.co/gawukale/Np0ggXs/mineral_spirits_on_wood_after_sanding.pdfIn PDF document text
    • https://cdn.sqhk.co/zegetaru/fEEidje/first_milestone_parent_connect_app.pdfIn PDF document text
    • https://zusaneji.weebly.com/uploads/1/3/0/8/130813769/7d5edcff94eba.pdfIn PDF document text
    • https://gorofegi.weebly.com/uploads/1/3/4/4/134462705/putitoj_levepezusatome_pimegob_jugutem.pdfIn PDF document text
    • https://cdn.sqhk.co/goremujoz/R1kQMAT/83753253393.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/ac4a96a1-b773-4df0-a6aa-a028ca9e49a6/colombia_vs_venezuela_en_vivo_internacional.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/430b0cc4-e046-410b-b033-a49c5af8d434/34536430882.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adac0182-dc2c-4893-9a89-21500624cda7/tulibrodefp_fol_solucionario_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/851a1616-4b13-40a0-94ea-5dd938b905ae/section_35_1_human_body_systems_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5037b2b5-12b8-4081-94df-be98257c0c7f/95630925769.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/108f2989-28d2-4686-b96b-9e6e810a1375/21859904490.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_off0000f225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF225 5008 bytes
SHA-256: 56aaccd57feb2cd11dc5d502ead77adad26d366fd82adce778b0611ed7932053
font_01_sfnt_off0001034a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034A 11448 bytes
SHA-256: e08f80eecc6e2d0fca8026a2a8633732103fc235f49b1ace20052909a684176e

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