Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef859e7962f70afd…

MALICIOUS

PDF

77.7 KB Created: 2021-03-01 19:28:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 49d0431e5e77a2751a75ac60adfa3a11 SHA-1: 5a9f10d53082ac96c6a51373bb14f77e6785abbb SHA-256: ef859e7962f70afd5bb402d045c7c821d7b1e02a952eb79761b103d794a191da
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The primary URL, fokemale.ru, is associated with a lure related to book summaries. ClamAV and ML classifiers indicate malicious content, specifically phishing and trojan activity. No scripts were extracted, but the PDF structure itself is used to host numerous external links.

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://fokemale.ru/award?keyword=5+love+languages+book+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456128/normal_60381f2960443.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381532/normal_600554a9ca7b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487381/normal_6003b35364cf4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403808/normal_5fcd0e114d2de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452382/normal_5ff9274fe9d47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477629/normal_5fe2378cabe7c.pdfIn PDF document text
    • https://dosisusibifoba.weebly.com/uploads/1/3/4/2/134236234/luliwemewasap.pdfIn PDF document text
    • https://cdn.sqhk.co/gasubapo/hjhcKjj/gravity_switch_unblocked_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479441/normal_5fd92e3b17535.pdfIn PDF document text
    • https://viradigoposexa.weebly.com/uploads/1/3/4/3/134383508/793ac5d0d9fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408323/normal_5fffa1330065b.pdfIn PDF document text
    • https://bokakarepexopo.weebly.com/uploads/1/3/4/7/134750167/260474.pdfIn PDF document text
    • http://pevawafo.iblogger.org/67037261482.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/lanaladu/maintenance_report_document.pdfIn PDF document text
    • http://jefevuxivux.epizy.com/artifactory_docker_image.pdfIn PDF document text
    • https://s3.amazonaws.com/kegovev/apa_6th_edition_academic_writing_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/vepuzorifivulipapuf.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/nolideji.pdfIn PDF document text
    • http://jeburam.epizy.com/81158126257.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_off0000e6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F5 5152 bytes
SHA-256: 2fbdc11e7782a6237700bca1cfb6bc23d304ffeaa3abae7cbf71ca49044ed523
font_01_sfnt_off0000f86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86E 10316 bytes
SHA-256: a2afe98123222263f53cf8dbc83738af982393dcc5372f3cd4e1f4e85366a9de
font_02_sfnt_off00011b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6C 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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