Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e2f1558962f746…

MALICIOUS

PDF

75.6 KB Created: 2021-02-28 12:58:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 227c000153b5e6f88ac14fc69dec4f27 SHA-1: 7cf7705d7b32fe7c367ef3ec35b27529a0e0124a SHA-256: c9e2f1558962f7466c24c99bbd13ea1e543bc9798e027aa7dbfdb5d065e4b6c8
74 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm designed to redirect users to malicious sites, with one URL specifically targeting 'nursing diagnosis for hypertension and stroke'. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to exploit users through deceptive content and external links, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • 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://vilenefex.ru/strik?utm_term=nursing+diagnosis+for+hypertension+and+stroke PDF link annotation
    • http://dorulezebum.sportsontheweb.net/16317731724.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/what_are_the_benefits_of_data_warehousing.pdfIn PDF document text
    • http://zekaxezixil.medianewsonline.com/14321636598.pdfIn PDF document text
    • http://rexevivejegox.scienceontheweb.net/how_to_find_the_magnitude_and_direction_of_resultant_force.pdfIn PDF document text
    • http://thesalle.xyz/widimezelenetajawome9b9xw.pdfIn PDF document text
    • http://dororuminaxa.mywebcommunity.org/vba_excel_tutorial_for_beginners.pdfIn PDF document text
    • http://salet.store/what_is_coming_to_netflix_february_2021n27zp.pdfIn PDF document text
    • http://sacredname.ru/82421211273zdboz.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/hajfBds/digdeep_image_recovery_iphone.pdfIn PDF document text
    • http://naturelofo.mypressonline.com/fosumunalowelaj.pdfIn PDF document text
    • http://helplnstagramcontact6088756.com/989328747332l41w.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/womirofop/ielts_vocabulary_booster_free.pdfIn PDF document text
    • http://woranuganavot.myartsonline.com/perseus_and_medusa_storyboard.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/world_of_warcraft_insurrection_guide.pdfIn PDF document text
    • http://pixuxurarosu.epizy.com/big_ideas_learning_algebra_2_performance_task.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/95168496082.pdfIn PDF document text
    • http://jitawidavez.atwebpages.com/what_does_cycled_mean_in_mtg.pdfIn PDF document text
    • http://felixoxajaxev.epizy.com/65914411930.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_off0000e8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A9 5408 bytes
SHA-256: 2e98bbfcbd5a0fc33af44d63148afaae41a929f896dbc7643a765e65a6e1d1d3
font_01_sfnt_off0000fb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1A 11200 bytes
SHA-256: 1d193fd2da7e84f201a79aefe5fc84f39b25ad8a50b850fedd04120e05468597

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