Malicious PDF — malware analysis report

Static analysis result for SHA-256 f14eee8858a675e6…

MALICIOUS

PDF

86.0 KB Created: 2021-02-24 00:33:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2f5e8f7b61073a259ff9df8814a9a7ed SHA-1: 6289f7409b22994ad123fd6463bf230488e4de01 SHA-256: f14eee8858a675e6f2db8ad725ef490b718fae2b689f98a61a853ecc0fa7555f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://druttle.ru/123?utm_term=sharing+a+twitter+post+on+facebook PDF link annotation
    • http://appless.space/gozaledenavububezepife7sckr.pdfIn PDF document text
    • https://risovokoxenixe.weebly.com/uploads/1/3/3/9/133997247/kopubunad.pdfIn PDF document text
    • http://fitokapss.xyz/605298102706t9nj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390385/normal_60114c2567145.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386839/normal_5febf3f93ce99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365998/normal_5fe699852eeb4.pdfIn PDF document text
    • https://difanewoxapazu.weebly.com/uploads/1/3/5/3/135321324/lazemuvid-zibum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478127/normal_601b6ed661f6f.pdfIn PDF document text
    • https://tafubevodila.weebly.com/uploads/1/3/4/0/134016741/2269268.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488315/normal_5fe73e820cebc.pdfIn PDF document text
    • http://egosikenclub.com/secret_garden_piano_sheet_musicmsnn3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504047/normal_5fecf72355b43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480899/normal_5ffbdf06ea99e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463808/normal_6027542fde31e.pdfIn PDF document text
    • http://instgrmmverifiedbadge.com/bluest_eye_summer_summaryp1d4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499958/normal_5fd3226f04039.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00011217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11217 5644 bytes
SHA-256: 24bcd3f969d97635b99ebfaf3a94bde4347d81a4596005b37fdf5d8c0c8700d5
font_01_sfnt_off0001255d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255D 10952 bytes
SHA-256: f72d88b7c928ce7962cb26053c8c133ff4f3bb0f1e0ca018b39dadc4d99fe50b

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