Malicious PDF — malware analysis report

Static analysis result for SHA-256 7345c31cb5dfa750…

MALICIOUS

PDF

355.7 KB Created: 2020-11-19 23:48:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 229234922772a8b2e7ca68d7f1a84671 SHA-1: cba4aa918da4b66d94691e502e278648e2135865 SHA-256: 7345c31cb5dfa7502fc2e83c44ca75bfea710fd399a82da69e9e6f89535335af
104 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by a ClamAV signature and an ML classifier, indicating a phishing or trojanized PDF. The embedded URL points to a suspicious domain, likely used for distributing further malicious content or phishing. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it may exploit PDF vulnerabilities or employ embedded JavaScript to achieve its malicious objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9707

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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://trafffe.ru/aws?utm_term=cambridge+checkpoint+mathematics+workbook+7+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382414/normal_5f8e19b811f98.pdfIn PDF document text
    • https://korebamo.weebly.com/uploads/1/3/0/7/130739662/5475709.pdfIn PDF document text
    • https://muwidewosavuli.weebly.com/uploads/1/3/4/4/134435377/2617002.pdfIn PDF document text
    • https://lewedizo.weebly.com/uploads/1/3/4/6/134610291/c0180b67d76fb83.pdfIn PDF document text
    • https://wuwuleli.weebly.com/uploads/1/3/1/3/131398564/tiriwegusa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413118/normal_5f9586d03f468.pdfIn PDF document text
    • https://vovopifibinurit.weebly.com/uploads/1/3/4/6/134654598/e1c8028f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386347/normal_5f908afbdfb6d.pdfIn PDF document text
    • https://punotajevi.weebly.com/uploads/1/3/4/2/134266109/badb8be.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/jaxesabi/tamil_months_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f8b69fe-bfce-4c0e-9410-ae259e30de22/zerenaxavinovewuped.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/63605271967.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_off000527d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x527D8 5736 bytes
SHA-256: 8fc73be3c20b545c549a450e3b64becaf11c17ca32ccb72e4497f3672a9afa38
font_01_sfnt_off00053b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53B3C 14080 bytes
SHA-256: bcd8981c0def9db69da13a95815918d7f09b380ebedbc44366685f649893856a
font_02_sfnt_off0005695e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5695E 16200 bytes
SHA-256: 077e56cd0fd9f04032d50b271b011b110066dc4ea68c364bd52d9d344075126f

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