Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f086855cd70b11…

MALICIOUS

PDF

76.7 KB Created: 2021-04-03 13:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e674652e925fd8a837b539a220e78748 SHA-1: cfd472701566ae4acedd2b06d4079e6fdb740ed0 SHA-256: c4f086855cd70b11559ba8b98685a37bd64d235568b8bd8170495f1ad17f084b
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, many of which are likely SEO-driven. The primary external URI points to a suspicious domain, 'lozipotod.ru', suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content.

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://lozipotod.ru/award?keyword=blockchain+technology+pdf PDF link annotation
    • https://figowemepiwe.weebly.com/uploads/1/3/1/3/131398533/pawetunexupulo_buvabuf_nonimiwa.pdfIn PDF document text
    • https://pogiwaxo.weebly.com/uploads/1/3/5/3/135312355/suropon-dunosoxado.pdfIn PDF document text
    • https://gofegupozomo.weebly.com/uploads/1/3/4/4/134479888/kuvaxozuwov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/window_pane_graphing_of_trigonometric_functions_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/elective_home_education_guidelines_for_local_authorities.pdfIn PDF document text
    • https://e9b66cc5-9289-431c-8f17-6739e1cd2d88.filesusr.com/ugd/c8f33b_f449cc554b0b4e009be27c531ed6f415.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/chemical_safety_board_investigation_reports.pdfIn PDF document text
    • https://e7ba4f66-d023-404d-a355-a5b98970f127.filesusr.com/ugd/cac9e4_c56e8dc3fcc5490f9d471600174baba0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/nodosutonupuxedifan.pdfIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_341fe6a5ccc14a628a60f40324e92866.pdf?index=trueIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_acafd85efbe34df2a567fe2d2b98baf9.pdf?index=trueIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_90f9da8844b64e6e9150c48039037ef4.pdf?index=trueIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_a68f23287ce140b9a439c37673052615.pdf?index=trueIn PDF document text
    • https://92fbd7ca-8480-4723-bb2c-19523f9dca15.filesusr.com/ugd/29946e_5563e96b2b584fb6888c00f73e5c78ab.pdf?index=trueIn PDF document text
    • https://0ea1ff7f-05b3-43a2-9744-178351a05ed1.filesusr.com/ugd/01f9b9_58d3b20ba87e42dfa7fdc5a29e2bb265.pdf?index=trueIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_42a19a6a6c1647dea62b663d7bd46b59.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/davubewu/34208089208.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/pedukaweze.pdfIn PDF document text
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_6667b448cf0342a5bf481083197edc58.pdf?index=trueIn 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_off0000eb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB66 5360 bytes
SHA-256: 6a4f00f57ffe0fa0da3c41e38622fec01474bf20666cd17692e4266dbc59e570
font_01_sfnt_off0000fdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB3 11852 bytes
SHA-256: 0c72c76a64c61dddc3f9ed89503e339bed656edd41a00237b23b40140b7e2aae

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