Malicious PDF — malware analysis report

Static analysis result for SHA-256 a173c6cae955d05d…

MALICIOUS

PDF

74.3 KB Created: 2021-02-20 00:00:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6e98be399c7683d9d7ae1988ce2290c8 SHA-1: 0c01eec332584d036d28a094bed7e62877bd02f4 SHA-256: a173c6cae955d05d9fd169f56859fdb7307733a21ab2213aadcace8100a9ca57
126 Risk Score

Malware Insights

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

The file is a PDF document that contains numerous embedded URLs, many of which point to disposable hosting or suspicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest an attempt to redirect users to malicious 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://baarspo.ru/123?utm_term=principles+for+differentiated+instruction PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403406/normal_601f21a1dc447.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472768/normal_6028e51cb8c41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484122/normal_6010394d2aa3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449012/normal_5ff65c80511f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375521/normal_602d1d56d36d6.pdfIn PDF document text
    • http://pazobano.iblogger.org/fundraising_letter_templates_free.pdfIn PDF document text
    • http://covid-19online.site/arabian_nights_sheet_music_free2tvny.pdfIn PDF document text
    • http://wemufonenirivor.22web.org/ali_maula_ali_dam_ringtone.pdfIn PDF document text
    • http://energierecrute-emplois.com/68329198076e3xv5.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/wefemabeni/xavatizedenomozixu.pdfIn PDF document text
    • http://lezegunotoxom.rf.gd/9319660940.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_off0000e7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B9 5152 bytes
SHA-256: 6574c8365904cd4408dc0d47373a84245b0a15ed171f79c07c79177f66fd34e3
font_01_sfnt_off0000f94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94D 10264 bytes
SHA-256: 844da1998b1b3cf0ee585cce3e139ba9aa58ed40989096ee7ca0acc9f23848c9

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