Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce45bc9415bd9dd8…

MALICIOUS

PDF

130.9 KB Created: 2021-02-20 11:27:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: d6cdee20da04d27f3c09cbb88017a2d7 SHA-1: 5d10d8e31c8e9c7c346c24563fb374490b0a5f07 SHA-256: ce45bc9415bd9dd8dadc6be8e1bfb6638c56f262394a6362b20d31747d23c3d3
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://maypoin.ru/strik?utm_term=seven+laws+of+success+herbert+armstrong PDF link annotation
    • https://tedajurilazunu.weebly.com/uploads/1/3/0/7/130739962/wawidavenenu_gegetad_vixekokukupo_duvubikexagala.pdfIn PDF document text
    • https://cdn.sqhk.co/wapadofiwe/jcgfjiI/superhero_heart_run_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385004/normal_601bbb03a01d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389570/normal_6028260eeff92.pdfIn PDF document text
    • https://cdn.sqhk.co/musezikuzapi/jgfhdcF/rezanoripogemagaxoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466376/normal_5fda4eefc2e18.pdfIn PDF document text
    • http://itdiscounts.pro/soxulanowuvuzigq5ch.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404124/normal_5fc76fe493121.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452587/normal_60116fc380372.pdfIn PDF document text
    • http://padapup.iblogger.org/is_it_worth_saving_your_marriage.pdfIn PDF document text
    • https://vilinumatilaji.weebly.com/uploads/1/3/2/7/132740241/95a5c138295.pdfIn PDF document text
    • http://tedosuz.iblogger.org/nyc_doe_payroll_calendar_2018-_19.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/hihgDQg/evertech_sandbox_apk_obb.pdfIn PDF document text
    • https://cdn.sqhk.co/muzolorakow/NjihdNZ/white_marble_agency.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/xazarujokemus/miberojopubixunik.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/clash_royale_apkpure_latest_version.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/36715499072.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_off0001c47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C47C 5692 bytes
SHA-256: e28d970d85778d47037a468ccc06f322e888801acbda9d34a7b7136159ab77bc
font_01_sfnt_off0001d7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D7D0 11408 bytes
SHA-256: 24c4b1de6ff733a2f525c320683cdac6a2e63cafa2e9461d17386c43ad795bcd

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