Malicious PDF — malware analysis report

Static analysis result for SHA-256 520efd63a70fb03a…

MALICIOUS

PDF

75.1 KB Created: 2020-12-28 01:00:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 810d47dbaaae79112441794d9737724a SHA-1: d150962d7a42c5aff1eac74930ea33b45adcbf20 SHA-256: 520efd63a70fb03ac8f6c1f34158845f9c3a82511e114928a9a74ee230715765
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary external links, 'https://trafficel.ru/strik?utm_term=ants+marching+one+by+one', is likely part of 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://trafficel.ru/strik?utm_term=ants+marching+one+by+one PDF link annotation
    • https://pafebexazare.weebly.com/uploads/1/3/1/1/131163914/dbbbd8a3c.pdfIn PDF document text
    • https://cdn.sqhk.co/zagusebipin/dN3idfQ/42143223218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421943/normal_5f98fa398652e.pdfIn PDF document text
    • https://cdn.sqhk.co/kowazodonaf/EhRicgf/bujaridetenawap.pdfIn PDF document text
    • https://nulomofog.weebly.com/uploads/1/3/4/3/134331556/webofokajag.pdfIn PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/tiviperotajem-sefekizaxezaru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369187/normal_5f8cffa63a095.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/1e35e3b9-7c17-4728-9863-d139e6f1160d/dosixetewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4d35578-5d8e-471e-97e7-29d5f1f263f9/quickbooks_2020_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/054b1dfa-288b-47a7-bb6d-2b0582272d34/33079878948.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e48748b-2c90-4985-b441-02d90d4c2121/pevej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fae0dbb-aff9-4dd4-ba41-42db69427584/rapports_de_jury_crpe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18efe428-0478-4128-bd08-678d95d17a3b/94155615798.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d44041f5-f764-4972-a59a-9354fae23fd9/no_querias_lastimarme_gloria_trevi_descargar.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_off0000e8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A5 5412 bytes
SHA-256: 24e87d6e5cba13e73ef3244281b8362646dc87f7d68ef042b4d0463644e613a0
font_01_sfnt_off0000faea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEA 10784 bytes
SHA-256: 56529ad6e0f460411019a09d8bb87d714da2cfdcbaed2568839c4ad9d05bd581

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