Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac54f4ded9fd7d5…

MALICIOUS

PDF

79.1 KB Created: 2021-02-19 08:34:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 108458f266c1f14c3761b9a11fb44d90 SHA-1: ebabce676298f10e2d6bf7f21bf3473bb1eeab7a SHA-256: cac54f4ded9fd7d54e81a7bfaaa8b0a8e95c58930a43d09679a1ea4b20564285
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://crophysi.ru/123?utm_term=another+way+to+describe+a+sunrise PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387933/normal_6002361722038.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471240/normal_5fe011d4df7b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464523/normal_600109285d970.pdfIn PDF document text
    • https://jimigafekalese.weebly.com/uploads/1/3/1/4/131407537/9119926.pdfIn PDF document text
    • https://momobamuv.weebly.com/uploads/1/3/2/3/132302987/zorilasipi.pdfIn PDF document text
    • https://gaxezoxo.weebly.com/uploads/1/3/0/7/130776828/87b9aeb7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425915/normal_5ff146d9b0512.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447640/normal_600e05a21fc39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445877/normal_5ff17dac8585b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389353/normal_5fccb657c1d8b.pdfIn PDF document text
    • http://micrometer25bill.site/cnn_news_today_live_nowxtte5.pdfIn PDF document text
    • https://fekamudubop.weebly.com/uploads/1/3/5/3/135325245/vesut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407793/normal_600ce588a4d18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393363/normal_6024eeeab20ee.pdfIn PDF document text
    • https://cdn.sqhk.co/motanunika/KGhcibD/marketing_strategy_development_example.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E2 5316 bytes
SHA-256: e40830defe52092e55e6915aa5a10f04374f8e8252868277920aeab425de17dd
font_01_sfnt_off00010c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C03 10276 bytes
SHA-256: be6ecf6555da4281cab34612ba8cb413d3511ba4b431d7b7121968680c2cb4e1

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