Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5add390d8b28802…

MALICIOUS

PDF

70.0 KB Created: 2021-02-20 20:04:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 66e4d2b94ff44992b84486054b68cfbe SHA-1: 52fe4df862be667b0935b6522d51bd016cf25547 SHA-256: f5add390d8b288026168626cbad4eb7ef8debeea5de538b828207d196dea098b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL is likely intended to redirect the user to a phishing site.

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=why+did+my+tower+fan+stopped+working PDF link annotation
    • https://baxorumele.weebly.com/uploads/1/3/0/9/130969728/211829c6e5c.pdfIn PDF document text
    • https://mafatuxaxi.weebly.com/uploads/1/3/1/3/131384293/4489613.pdfIn PDF document text
    • http://vknacruckalaikov123.xyz/22658358252hzt0j.pdfIn PDF document text
    • https://gozerezujokosas.weebly.com/uploads/1/3/4/8/134856803/zavakidafojor.pdfIn PDF document text
    • http://pubggaming.online/86321582686l3nn9.pdfIn PDF document text
    • http://citimart.online/mifavugudikozupupakoloov15p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492575/normal_601c62a070730.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424040/normal_60199135ba6c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383170/normal_5fcf073963c84.pdfIn PDF document text
    • http://voiprormul.xyz/pals_pa_phone_numberaklyi.pdfIn PDF document text
    • https://bovikobugekut.weebly.com/uploads/1/3/0/7/130775803/vogapolumijimes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489988/normal_5fc628df2ee39.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/suxuzubojut/evaluating_variable_expressions_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/limited_partnership_agreement_template_delaware.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/webex_room_kit_installation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/html_form_validation_using_javascript_source_code.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/why_is_my_tv_not_connecting_to_internet.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/job_interview_analysis_report.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/cpa_marketing_guide.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_off0000d3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F1 5696 bytes
SHA-256: 4fd38b4ace1c67c4683f81056aa78fb2f444a413ab8178b91f40987a83491a43
font_01_sfnt_off0000e74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74D 10480 bytes
SHA-256: 3b6b440563ed4bdad71d44f94a150f2caf96c881a5fb070b767a3c40c61df8c2

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