Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de16bcdd282b891…

MALICIOUS

PDF

75.4 KB Created: 2021-01-06 10:02:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6efba53f44734e971be58f6868ecb3a1 SHA-1: 4f222e582878db7d8fc8e2d392a523111bcf752a SHA-256: 5de16bcdd282b89126b26bb0c664a38f9c71e7666f7cc4fa6daaa8ca1929d62e
154 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 routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://cctraff.ru/aws?utm_term=daraz+app++latest+version In PDF document text
    • https://static.s123-cdn-static.com/uploads/4386593/normal_5ff505137f41d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453551/normal_5fc5ab6b194fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450158/normal_5fac47af607bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389355/normal_5fc6cb84bacb6.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexufi/gehbicq/kifudixavigojujujisagumup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413375/normal_5fe3e9e09e298.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470968/normal_5ff3bf56977e4.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/bubeto/67966362051.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/77654649442.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/laxepal.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/subaxidonikorimuxu.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/eclipse_java_ee_installer.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/liriwewo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD444 4920 bytes
SHA-256: eff002395aa95bb7e68ea955b759fb2a321eab35760c8bacbddf147b7f61ed12
font_01_sfnt_off0000e524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE524 11076 bytes
SHA-256: cfd02cf1bba9a0919e1ab613479ce2dc6300e03bfe846e74fdf60f5495049002
font_02_sfnt_off00010b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B25 16212 bytes
SHA-256: 7c1caef01361c77dfec1bf4d8846fd912f6342a4f876c7fabb1ce0c86f636f29

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