Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d902d76217d528…

MALICIOUS

PDF

81.9 KB Created: 2021-02-18 13:50:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4db4ee4f2c40e6cf6f2bcbe3c91facb4 SHA-1: aadd62cb0ea5d56b7086e746d5c9083b65d2bd61 SHA-256: 52d902d76217d528131d0690de58eeaf6c3cc29759f6d77bb82b1ffccdcd3c0d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to SEO-optimized PDF documents, suggesting a link farm or spamming operation. The embedded URLs are likely used to redirect users to malicious content or phishing sites.

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://jacksth.ru/wix?keyword=hayward+swimpure+plus+instructions PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4373004/normal_5ff010d13d3e6.pdfIn PDF document text
    • https://gamuzajebi.weebly.com/uploads/1/3/4/4/134481120/0155e56bfcaabb5.pdfIn PDF document text
    • https://zukutalemuz.weebly.com/uploads/1/3/4/5/134582669/5e7c509333fbc00.pdfIn PDF document text
    • https://sudiseva.weebly.com/uploads/1/3/4/4/134470115/335516.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451019/normal_5fcdeebff41a2.pdfIn PDF document text
    • https://kufobuzu.weebly.com/uploads/1/3/5/3/135330794/xapure.pdfIn PDF document text
    • https://biwakegexenulu.weebly.com/uploads/1/3/4/4/134437141/9d47d37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481170/normal_5fe69bdcd9c96.pdfIn PDF document text
    • https://nulijuvak.weebly.com/uploads/1/3/3/9/133986618/duzevumabe.pdfIn PDF document text
    • https://jotogenawe.weebly.com/uploads/1/3/1/4/131406354/07999723.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421767/normal_5fec9154c87be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411001/normal_5ff097e9abcd3.pdfIn PDF document text
    • https://kumeboxisadinur.weebly.com/uploads/1/3/4/6/134684257/ddcd0347c6ae1c.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
    • http://kezazole.epizy.com/garisapanuwimubopof.pdfIn PDF document text
    • http://rerorupi.rf.gd/balupu_video_songs.pdfIn PDF document text
    • http://lenixad.epizy.com/ximupivuboni.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_off0000f65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65E 5256 bytes
SHA-256: 06a27f1e4cc1238db1565a7cba9205fd06b20113c35139882bacf2e6a8c524fb
font_01_sfnt_off00010834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10834 10516 bytes
SHA-256: 8ab6c71124de670138734368240849313eb67cb84b3bd7766255fd3a695dce31
font_02_sfnt_off00012c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0D 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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