Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b3680ad4041fea…

MALICIOUS

PDF

75.9 KB Created: 2021-03-20 01:41:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8f1999ccb9b3a088d1b63e6692d62bbe SHA-1: f14f75a68d87aa937c726ccc347bc098ee5903aa SHA-256: 23b3680ad4041fea51cadc66692f2c2f0be12630040ee032877d8f6a7f5bb70c
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that lead to suspicious domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the presence of multiple external URIs points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://druttle.ru/award?keyword=administration+department+functions+pdf PDF link annotation
    • http://leree6.club/gdpr_photography_consent_form_template_freeipyug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407552/normal_5fe14e941fd68.pdfIn PDF document text
    • https://jabizujosewej.weebly.com/uploads/1/3/4/5/134584717/9506884.pdfIn PDF document text
    • http://shopwithsale.website/hedwig_s_theme_violin_sheet_music_easyt2d61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382773/normal_602164e7cb0f3.pdfIn PDF document text
    • http://homearfes.com/apartment_lease_form_freep4inh.pdfIn PDF document text
    • http://esplus.pro/limejeripelotesamu7w81z.pdfIn PDF document text
    • http://subfamjtii.site/ripinonibatonudijezus1p1bk.pdfIn PDF document text
    • https://benarejara.weebly.com/uploads/1/3/1/4/131407695/wimivefirizapeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8228b343-b44a-4660-bfa1-ae6e913f854b/16254871042.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6f43281-3d6a-4ee3-8f36-88795fe5d34d/honda_rebel_500_top_speed_km_h.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/65567323442.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/cricut_crv001_cartridges.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/32311795589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49fe0f91-6f06-4362-a69a-372f0250178d/will_yeast_ferment_sucrose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d6b8b95-2ca4-433c-a692-50ebaa877a4a/how_to_get_certified_safety_professional.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb7d19cb-41f6-4050-8ee2-a0610e29e92c/posing_guides_for_photographers.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_off0000e819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE819 5260 bytes
SHA-256: 1b3e80fafd4217312107f5bf95415bbf923c6c0975dc5e8d89244ef0ee0dd65d
font_01_sfnt_off0000f9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E3 11536 bytes
SHA-256: fe61fd170b6d08481e368693c41d0298b20350a092934a76c6aa0a0dbc205ae6

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