Malicious PDF — malware analysis report

Static analysis result for SHA-256 845c22e1d0af4423…

MALICIOUS

PDF

74.5 KB Created: 2021-02-24 01:23:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3b752705eab1ac1f57c8eb9b336125a3 SHA-1: 399675574b150975ff7048d9105f1df25cf4f54b SHA-256: 845c22e1d0af44235ec355aa6e577faa7b60cf5864c65f919e28f364933306a8
74 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://druttle.ru/wix?keyword=the+incredible+hulk+full+movie+free+download+in+telugu PDF link annotation
    • http://24goodstore.site/grid_template_areas_tutorialmt0p0.pdfIn PDF document text
    • http://keksik24.ru/bupulabubovanavekenrosm2.pdfIn PDF document text
    • http://discovljzg.fun/salesforce_reports_and_dashboard_interview_questionszqvia.pdfIn PDF document text
    • http://milanbeach.fun/juwulojop8dv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454281/normal_5fced4ee7ebfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384645/normal_60247647c8f84.pdfIn PDF document text
    • http://apple-fruit.space/maytag_neptune_front_load_washer_not_draining4pr77.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/kovilowab/vemenuxizoke.pdfIn PDF document text
    • http://fowasabitafal.epizy.com/jomakelisapupitaroseran.pdfIn PDF document text
    • http://dinelak.rf.gd/linksys_e1000_configuration_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/heise_notepad_portable.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_off0000e582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE582 5560 bytes
SHA-256: a904646bdbfd68511bc1d3387ed228536d3b5ae3073352f7fa8fa833ba18ac12
font_01_sfnt_off0000f857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF857 10644 bytes
SHA-256: eed991a3703fcee6abff41d59dd69ff7137dea1865626af1be7a251b4e001324

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