Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7eede3a79942b18…

MALICIOUS

PDF

75.8 KB Created: 2021-02-11 05:42:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5cd3bfb81d85a07863327a1a120b73d3 SHA-1: 2fc6aedf38aa22be45e658e1f0a860fa595c91fb SHA-256: c7eede3a79942b18919c672c65bd8f60f63d7349ad48ab957c29d75232cde763
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain metadata related to a PDF generator, and the file itself hosts a large number of external links, many pointing to PDF files, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=aroma+professional+plus+rice+cooker+10+cup In PDF document text
    • https://cdn-cms.f-static.net/uploads/4477156/normal_60246c6084b8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473432/normal_5fcc5389a9cbb.pdfIn PDF document text
    • https://welirupew.weebly.com/uploads/1/3/4/6/134662060/dexikosixut.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/pjejjvd/funny_pictures_of_animals_pooping.pdfIn PDF document text
    • https://cdn.sqhk.co/xumobopore/ka4whge/56230923706.pdfIn PDF document text
    • https://sixebujexe.weebly.com/uploads/1/3/0/7/130740217/bfb763f904db85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408997/normal_5ff92dc7e8ac8.pdfIn PDF document text
    • https://vutakajar.weebly.com/uploads/1/3/4/8/134896426/da187.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/wowonesoribu/dovupimiwedajogavumew.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/accounting_ledger_excel_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/nikudapavakakagerilenir.pdfIn PDF document text
    • http://jisixapuwalim.epizy.com/82188838097.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/angular_material_form_field_height.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/talipapolixigejiri.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/muxobadotoza.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/lakshmi_narasimha_swamy_songs.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_off0000ec37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC37 5408 bytes
SHA-256: d713281a820c599fb2331e2a5ac1af3d87239f1481dfa1c06c020007ae3e5f00
font_01_sfnt_off0000fe88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE88 10448 bytes
SHA-256: fb7f0794f394bbfc5a0d33b0063e18cf3e0f16b891b5983dbf4796ac1afb4b76

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