Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0bbf66c6356f22c…

MALICIOUS

PDF

92.7 KB Created: 2021-01-05 03:14:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b1bb44372427b36c6912c3a9d7f0502a SHA-1: 9298d7ed479cb852ed275567176863aa922a9d6e SHA-256: d0bbf66c6356f22cc6384211ee4205847480bef737c6febbf2fa3ed13150f2a1
172 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains numerous external links, with one prominent URL pointing to a suspicious domain. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting a potential link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site or download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffe.ru/aws?utm_term=england+basketball+running+score+sheet PDF link annotation
    • https://cdn.sqhk.co/bimepefav/eheBjjG/44359082197.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450640/normal_5fbaff8c4031a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388274/normal_5f98c4f820e02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374002/normal_5f8d1e465334e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383568/normal_5f90e21a20dc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387408/normal_5f9cc5cbee476.pdfIn PDF document text
    • https://wojatobarub.weebly.com/uploads/1/3/4/6/134612389/dc97c68acf6d6.pdfIn PDF document text
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/fatafanutojor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375528/normal_5fa5d7a10f558.pdfIn PDF document text
    • https://cdn.sqhk.co/jivaduzar/Sziiwje/woguxarazow.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/xeropizuwe/extended_family_tree_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bca1644-2fc0-4ea0-ae57-3c9a638e47bf/you_were_born_rich_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/bezabafipulasefigujulepu.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/dasuvunabofolatexowex.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/97004707941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82ac3da9-1054-4050-b78c-92666eacfab1/70692739408.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/android_create_folder_in_root_directory.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_off00012643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12643 5364 bytes
SHA-256: a5fa6fe4845a99238c533485906966dda002904c9de40f49a3c04555e2e94890
font_01_sfnt_off00013875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13875 13088 bytes
SHA-256: 350ffe6483bad44ac0c0fc8d52e557c401546e63aab122ec2732b906bb6104ad

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