Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a66c9cf905e327b…

MALICIOUS

PDF

74.5 KB Created: 2021-02-26 13:34:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ad16ea64fc3a8c1e22ccfbfed7d35969 SHA-1: 4c95a9a49c664b44f6ad60e8d9b9349f5995eeda SHA-256: 1a66c9cf905e327b28ba833428fe68d36aacb544d4d271fd83342736a3665a8b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, directing users to various PDF files hosted on external domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

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://xezojetit.ru/award?keyword=sense+and+sensibility+movie+director PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4392873/normal_5fed154483cd2.pdfIn PDF document text
    • http://tedamowajowiw.22web.org/vexexixojewadutirevafo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389097/normal_5fe5ff8a7ae1a.pdfIn PDF document text
    • https://gavititexufo.weebly.com/uploads/1/3/3/9/133997787/e1ac50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480387/normal_5fc89788a3d23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420448/normal_6003200fcb40d.pdfIn PDF document text
    • http://dijawobal.iblogger.org/wokegoparinufezaguzop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500910/normal_600df865cd0dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420761/normal_6009f3a586765.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446634/normal_602711ee8f91d.pdfIn PDF document text
    • http://ruzazeruduzelu.22web.org/tetodowigupuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://diturasenupope.epizy.com/wenavivevisara.pdfIn PDF document text
    • http://mipaziti.rf.gd/hoover_windtunnel_3_pro_pet_hepa_filter.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F3 5492 bytes
SHA-256: a4200f7c18cc577eb712ce4983c812479074996dfda913ca548fa8779aad7df0
font_01_sfnt_off0000f98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98D 10316 bytes
SHA-256: bd70082cdc398c6910279d748b8c9ec8332656598695920c92a8507121df7f4a

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