Malicious PDF — malware analysis report

Static analysis result for SHA-256 189d77c72bd8d356…

MALICIOUS

PDF

78.2 KB Created: 2021-02-25 00:36:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 50c7d00cdb4a3612488f75d23a58aeba SHA-1: b621d50863c7c708d866e7b459ff2174e6bb1f0a SHA-256: 189d77c72bd8d3567685a0316f6b42ebab5cb6992168c8ced7851bd54db25e2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm designed for SEO manipulation and malware distribution. The presence of ClamAV detection and ML classification further supports its malicious nature. The embedded URLs, particularly http://13millions-warzone.store/peribepudosojisunjn5w.pdf, are likely used to host or redirect to malicious payloads.

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://leonvi.ru/wix?keyword=area+and+perimeter+of+a+rhombus+worksheet PDF link annotation
    • http://13millions-warzone.store/peribepudosojisunjn5w.pdfIn PDF document text
    • http://cozyplacefor.rest/zotokakevanezotawvccf5.pdfIn PDF document text
    • https://povizizumor.weebly.com/uploads/1/3/4/6/134636509/7ac3d1588e.pdfIn PDF document text
    • http://soldonlittleton.com/quadratic_equation_to_vertex_form_converter1j3g1.pdfIn PDF document text
    • http://nesobaka9.xyz/93964609017q3t57.pdfIn PDF document text
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/weguf.pdfIn PDF document text
    • https://nawixelufa.weebly.com/uploads/1/3/5/3/135317770/8867595.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://s3.amazonaws.com/bezorito/98614324749.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/performance_exhaust_shops_melbourne.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/madras_university_old_question_papers_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/619251478.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/siop_lesson_plan_template_1_editable.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/beej_s_guide_to_network_programming_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/toxobuzumebineve.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/algebra_1_review_worksheets_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/papimapunijevategive.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/81757126092.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_off0000e588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE588 5416 bytes
SHA-256: a35ad7919b92058a9019d93659f8713e0bee1295c0ddb503b8858d78813e1237
font_01_sfnt_off0000f7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C8 10984 bytes
SHA-256: da54d7c1818b4f53b3f15a4d5436f2b3a106ce721d500ecc6e821b49362cba54
font_02_sfnt_off00011d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6C 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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