Malicious PDF — malware analysis report

Static analysis result for SHA-256 549e357587e27e6c…

MALICIOUS

PDF

70.1 KB Created: 2020-12-22 16:48:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9874bd9b08c732270a306c255f4fbdb1 SHA-1: 9142358dd862e77f0c53b3eef18722c58c6339e7 SHA-256: 549e357587e27e6c21b4751994a80d3bf8445ee0cd9376fd16917d3db144afef
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://traffset.ru/strik?utm_term=dino+donkey+dash+game PDF link annotation
    • https://zigudufojivop.weebly.com/uploads/1/3/4/7/134718002/8c3e0a7c5.pdfIn PDF document text
    • https://mivodijabid.weebly.com/uploads/1/3/4/7/134732330/9fa2fe0a7.pdfIn PDF document text
    • https://baxojozejaxofo.weebly.com/uploads/1/3/4/5/134586757/guviweligazavise.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4a943c02f22b9d036ed6/1606371997460/lewis_structure_rules_and_exceptions.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdfdaa4c2d4633280f892cd/t/5fe0c723152a8c5c44af6bd8/1608566564127/math_worksheets_for_kinder.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc653a7cd1e280355f935b8/t/5fc6ae8708845d092478001f/1606856331037/rimowexoxowevofapajaxeteg.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/senus.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/jupuliduzurekifigubulimu.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/562593927.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/855703eb-8fa7-4b7f-a4cd-98c960bd954a/90502349428.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/alto_sax_sheet_music_pop_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/jewobeza.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7b22444e997374a2e50e6/t/5fca7d5d8aff060d4dcf044a/1607105887725/color_by_number_free_printables_minecraft.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_off0000cac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC6 5276 bytes
SHA-256: b10cbbd995f28093abd5b12afb6598f35349201327e022a5452c8e8c7b14b8d5
font_01_sfnt_off0000dcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAB 14340 bytes
SHA-256: 8ea7df18b993749dc1e16e9f7b593f96e41cafbf9a9f3663a86a0f686247a162

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