Malicious PDF — malware analysis report

Static analysis result for SHA-256 395624db3ba34516…

MALICIOUS

PDF

71.3 KB Created: 2021-02-19 01:27:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 43870560a7eb48b7361f25f925fc775f SHA-1: 87ad20943bdbe99e22b7815d7eabca29d19ab25a SHA-256: 395624db3ba3451606a68bf222322736f16b65dd44b1ab8db8d9ef73aa686874
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful websites.

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://maypoin.ru/strik?utm_term=how+can+i+be+in+charge+of+my+own+happiness+quotes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422163/normal_5fe6501bd9a37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365584/normal_5ffcc46b1cdb0.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/aggmYmy/ring_a_bell_idiom_usage.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465690/normal_5fcceefdc246e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490265/normal_6008340b6bf30.pdfIn PDF document text
    • https://ranogokosupevi.weebly.com/uploads/1/3/1/4/131454436/karamojepazikit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368238/normal_5ff96bff67468.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/jO3hhji/zozapovetidosapotuvore.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453563/normal_5fd2eae8cb945.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402938/normal_5fd97d9798f71.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/b7wqrih/benoxobomalinubulujexur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373505/normal_5fe869ef84994.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/3ghE1kB/86582936457.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/zaxawetawupo/nifemuj.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/firebase_dynamic_links_android_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/62291113004.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/beseluzarosixulevof.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/amerex_b402_manual.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_off0000d926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD926 5816 bytes
SHA-256: cca6956f57c62614cad340d738a4dcd7fbc77072e9a44613a570b8a5d5095c3e
font_01_sfnt_off0000ece4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE4 10252 bytes
SHA-256: 0963d0eaae467fa3060a1a0e8471d2ca4f726c0fd11e5c4d6770a9f855df4d76

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