Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8ad8615cd0f3ea…

MALICIOUS

PDF

70.5 KB Created: 2020-11-19 19:17:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: c2195a517f3e38289fcaa7e4cb24a699 SHA-1: d35b7d4ae8f7642c3a63eceab952e225f5fb7abc SHA-256: ef8ad8615cd0f3ead6a210f0e1f328aa88be9dd5ac61df0ee8032a998d09efaa
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a PDF link farm. The presence of external URIs and a high ML classifier score indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content or engage in SEO manipulation.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://trafffi.ru/123?utm_term=rhino+prime+warframe+2019 PDF link annotation
    • https://zuparimetusu.weebly.com/uploads/1/3/1/3/131378993/766426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425010/normal_5f9e092159b06.pdfIn PDF document text
    • https://razemifutibedur.weebly.com/uploads/1/3/4/4/134431978/3236353.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387582/normal_5f9c47a90f1ed.pdfIn PDF document text
    • https://lozulijulejibog.weebly.com/uploads/1/3/1/8/131857057/fofukuka_diripifaxesed.pdfIn PDF document text
    • https://mamaganonofob.weebly.com/uploads/1/3/4/6/134602085/c6ab03c907b5a9.pdfIn PDF document text
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/87c207d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pogolo/paypal_money_adder_download_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/71272288855.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/free_emr_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/vogusemaluf.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/animist_religion.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/rainbow_words_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bcdf128-4c1d-4588-9ae1-a03d2c956f8c/nidolokulowadelasiru.pdfIn PDF document text
    • https://s3.amazonaws.com/naramuro/guy_kawasaki_the_art_of_the_start.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EF 5220 bytes
SHA-256: 0e39aa80b34d59bf771a34966fb3db3bd75b9d7c2444186cb1f2e7a3cd0cab5f
font_01_sfnt_off0000da83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA83 10680 bytes
SHA-256: 98e5408bcd7ee49c7defce20bcc80accec78b96c5b477b7e94cd04fcceb009f6
font_02_sfnt_off0000ff0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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