Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccee05ee550a973a…

MALICIOUS

PDF

68.4 KB Created: 2021-02-18 19:41:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 17730436d7d85964cee95927745bdd4e SHA-1: 1c93da322250e0875a719c60f3d87ddbb3690b9f SHA-256: ccee05ee550a973a0dee1efd2a091ef1e90a1e67eb7ab2ba45597ec1ef2677ee
126 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm hosted on disposable domains. The embedded URL points to a site that likely serves as a gateway to further malicious content, potentially a phishing page or a downloader. The PDF structure and heuristics suggest an attempt to disguise malicious links within seemingly legitimate document content.

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 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://jottigo.ru/wix?keyword=freedom+jonathan+franzen+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390664/normal_6012e6f0ee885.pdfIn PDF document text
    • https://cdn.sqhk.co/duzimisese/heCibia/watch_free_movies_and_tv_shows_instantly_online.pdfIn PDF document text
    • https://cdn.sqhk.co/rewazexi/hagguij/idle_harbor_tycoon_incremental_clicker_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411500/normal_602b977127058.pdfIn PDF document text
    • http://workbykoder.xyz/kilelaxamcf1fx.pdfIn PDF document text
    • https://cdn.sqhk.co/jekidase/OQidgiR/my_portal_server_ip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420592/normal_5ff20f62991d4.pdfIn PDF document text
    • http://kraftmann.su/volarimarikuvife255r.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/yXf4ibM/31163761699.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384828/normal_600d441e3023d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451755/normal_6022c70bd1608.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378845/normal_6005a13e7d390.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409403/normal_5fe8dd306809c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duzixaludu.rf.gd/31315220543.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/90635699602.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/pugowivuwi.pdfIn PDF document text
    • http://kajufikuxididon.rf.gd/free_envato_keynote_templates.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_off0000cfcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCD 5276 bytes
SHA-256: a6a724e0d891028b50373a43499feff0270b22f9f2f0b94588def0ec658c5f33
font_01_sfnt_off0000e1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AF 10196 bytes
SHA-256: 7cbc70a557de8fea774707ce3dba79ed1f2c9cc040c692b0c64ffa95bbbb8b2b

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