Malicious PDF — malware analysis report

Static analysis result for SHA-256 10cc153a5015451a…

MALICIOUS

PDF

72.6 KB Created: 2021-03-01 19:37:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 6c257fe1b965b2a3d7b84da832644321 SHA-1: 0080625b40dff0d1211e010be24ac2a7301803a7 SHA-256: 10cc153a5015451ac2f3361c12ca8ccdd656fc115c0c65b36ee200e8e7635e22
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and the nature of the embedded links suggest the document is designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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://nipisod.ru/aws?utm_term=amazing+grace+chords+piano+in+c PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481273/normal_600b6581ccef7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489853/normal_5fc6742e85158.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410975/normal_5fe15eba2ad14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393890/normal_602af24ce0a3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375095/normal_5ff430a3a1631.pdfIn PDF document text
    • http://masalev.ru/how_to_drain_keurig_k40w6t5c.pdfIn PDF document text
    • http://supermagazforsale1.xyz/puzafapazusanakuwo39g2n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419433/normal_60191ee01b3bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482188/normal_5ffcfee7e36c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484355/normal_60209318e3e5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482219/normal_5fd29adef30e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502236/normal_5ff79c65424f7.pdfIn PDF document text
    • http://rodina38.ru/nizizozuwuxomirorejisanat61d5i.pdfIn PDF document text
    • http://pelistens.xyz/peter_strawson_freedom_and_resentmentciblg.pdfIn PDF document text
    • http://yarrebitteh.online/xibomenebidjpo8w.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/rizoli/verb_forms_english_table.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/industry_analysis_reports_companies.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_off0000df84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF84 5496 bytes
SHA-256: 56c8d9fd5387bf79f85d482d9321093826205b7f8a7dfb06ee04d75d1e436d48
font_01_sfnt_off0000f20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20C 10420 bytes
SHA-256: 95f4503688fbf5f7aace26bf1dc90082fad2cc1a561a72337549e2acba60c989

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