Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d29aaec9ab858a…

MALICIOUS

PDF

66.2 KB Created: 2021-03-03 20:47:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 84b41edd97141b607aba73d50d68e2a3 SHA-1: 9561a2841967234b8d251cbe4effd5f732144021 SHA-256: 55d29aaec9ab858acc4e60dcc4a5f381f0804015c98d75f71d7436ad87ce3459
156 Risk Score

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-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://midufefew.ru/strik?utm_term=what+is+the+theme+of+the+fox+and+the+crow PDF link annotation
    • https://muwikoli.weebly.com/uploads/1/3/2/7/132740525/5318337.pdfIn PDF document text
    • https://fisujurij.weebly.com/uploads/1/3/1/4/131437504/5724103.pdfIn PDF document text
    • https://komuwewolidixat.weebly.com/uploads/1/3/4/8/134871085/6714396.pdfIn PDF document text
    • https://zuseluxutiv.weebly.com/uploads/1/3/4/6/134686448/rizubazod.pdfIn PDF document text
    • https://zepigebilotexo.weebly.com/uploads/1/3/0/7/130739401/43b69f8842.pdfIn PDF document text
    • https://tavutafaj.weebly.com/uploads/1/3/1/4/131482866/ee669faf7b67438.pdfIn PDF document text
    • http://richmaya.site/xusukatexem1z1g.pdfIn PDF document text
    • http://idealica-tufficiale.website/hmp_maze_prison_escapegtwlo.pdfIn PDF document text
    • http://eglo.club/86418688510qp98o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://noboxiroxe.epizy.com/eviction_notice_template_ohio.pdfIn PDF document text
    • http://petikagemejol.rf.gd/43797996542.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/22598692951.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/86158834901.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/infringement_notice_statutory_declaration_form.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/destiny_2_pc_guide_deutsch.pdfIn PDF document text
    • http://tosefiwaniw.rf.gd/crash_bandicoot_mind_over_mutant_wii_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/evolution_theory_timeline_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/register_marriage_certificate_online.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_off0000c879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC879 5404 bytes
SHA-256: 1172b40bde952d44b91e7b6403974c858b9b294fbc885425c8fa0bd85a734d7e
font_01_sfnt_off0000dac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC7 9604 bytes
SHA-256: e456e64eea34a1685e3d3b6db9625f8300c5ee2c891ce47cb6781bf6738fc3f6

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