Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e3f5bb7355ce40…

MALICIOUS

PDF

81.4 KB Created: 2021-04-25 17:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 976608fbb880c65677a555a153d50a43 SHA-1: 02ddf582f671540396fc962a26c04877ce0e4402 SHA-256: 52e3f5bb7355ce4025bfe7e45a4afb86e6f703a5f084f0701d9c82c44fbbd923
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 a large number of external links, many of which are to PDF files with numeric slugs, indicating a link farm for SEO manipulation. One of the primary external links points to a URL that appears to be part of this scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through the link farm.

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://botokaw.ru/strik?utm_term=how+to+train+for+half+a+marathon+beginners PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370074/normal_603ac0dd5662d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481424/normal_5ff6aaf87326f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471686/normal_5ff9d89198fa6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412897/normal_5ffe2bba9470d.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/a7f35057-b6ef-4134-bd86-d6eb8d39305c/romixexolekozosusose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75b28a2d-6f4f-4989-93c3-e0cc18cab48a/haier_mini_fridge_compressor_not_running.pdfIn PDF document text
    • https://7ed1f289-57d1-4e2a-9ee4-b64e0eb498cf.filesusr.com/ugd/13dc0c_6319b3406cf942a78bbb9b036e818a2c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/classifying_triangles_notes_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/dispute_inaccurate_information_on_credit_report.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/antimanual_de_filosofia_resumen_capitulo_4.pdfIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_340cb15c30fc46a1a26f26635f73fb17.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/moviesda_tamil_dubbed_horror_movies.pdfIn PDF document text
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_52e98eaf17e544d686e07c308645e813.pdf?index=trueIn PDF document text
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_4e705743b39549df8505709027c01ef2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/the_left_hand_of_darkness_chapter_2_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17afbfdd-1eaf-4b61-80a7-e85fd2eab20e/tidepadelelizanegepu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ad2ecf6-ed04-41cb-ae78-69cb84482f72/todalipipiwokazewupodibum.pdfIn PDF document text
    • https://dcc20dec-0195-4543-b617-cfb82efd15f0.filesusr.com/ugd/30ea26_788abb47c82b473eafc0e4a6f1dfe1ec.pdf?index=trueIn PDF document text
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_d05bb04c48dd468d8e50767f7854005e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sikuva/toward_an_anthropological_theory_of_value.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_off00010116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10116 5376 bytes
SHA-256: 2faba156f112c787ef0fcb5199fb47eb317dff582bf907d2e3ede5bf0dc1522e
font_01_sfnt_off00011345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11345 10896 bytes
SHA-256: 9d90f307fb4a50e98f52f61cde656c2953b1e253422dfa570a61d3c4e1839dad

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