Malicious PDF — malware analysis report

Static analysis result for SHA-256 14d3940dc47a60a6…

MALICIOUS

PDF

68.9 KB Created: 2021-02-21 10:19:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9f6ff9f5e9a2a4226222b8fd4b3a2b8c SHA-1: 128147e6c0747a499c32c7a2c2f02beb6cc9c14c SHA-256: 14d3940dc47a60a6df6aa91f31f4f4b1580757e8271fdc227df0e5490757998a
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=latin+library+4th+declension PDF link annotation
    • https://tusatetop.weebly.com/uploads/1/3/1/4/131408029/bujadupekamufup-sesupapa.pdfIn PDF document text
    • http://xiravudes.22web.org/microsoft_word_calendar_template_january_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_601b668621947.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366027/normal_5fcd12f64de0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408987/normal_5ffdb485b97f8.pdfIn PDF document text
    • https://kazanuwe.weebly.com/uploads/1/3/2/6/132683097/b0104b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370540/normal_5fc61fe30b94d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379379/normal_5fe022a9f09e5.pdfIn PDF document text
    • https://zovarufegurer.weebly.com/uploads/1/3/4/6/134625168/buxobu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492600/normal_600221b15654d.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/ZQhf8CU/retro_video_game_ringtones.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375894/normal_5fff415f5a86e.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/guvovigo/46341126315.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_off0000d103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD103 5300 bytes
SHA-256: 9c352ff3adbc95cfdbccff4d38104ffbadb9fc38405e48219fe20ac024dbf399
font_01_sfnt_off0000e309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE309 10484 bytes
SHA-256: fff2e361f4776825e5721f01ad6af4196bd84b29e05b4fc22964085cf9575397

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