Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a8626ce791fa74…

MALICIOUS

PDF

78.1 KB Created: 2021-02-11 10:50:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7ce9ef4e846a8f6998f813055ebdc678 SHA-1: c9b713afbbf34407db1bd8c4afa8791742dd79e6 SHA-256: 72a8626ce791fa74683ac87480428a0c99adbb3b43bfcd2546d73019eaeced43
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, indicating a phishing or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure, likely attempting to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/aws?utm_term=prevention+of+water+pollution+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415544/normal_5fd7a2122036d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490367/normal_601c8e384aded.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410416/normal_6021472fb3e9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481155/normal_601d839851b33.pdfIn PDF document text
    • http://ueuniti.website/3918128146066c6e.pdfIn PDF document text
    • http://italiahot.space/sogotito73dlw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379744/normal_5ff30249d200d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419225/normal_5fe156263781f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391898/normal_6015b6a7ed306.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454167/normal_5fe089d2e8ead.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495254/normal_5fdc2a89f2e22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373297/normal_5fe78ce71fffb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403283/normal_5ffe9cd3b4619.pdfIn PDF document text
    • http://lnstagramsecurity.net/xitadetexukumjxson.pdfIn PDF document text
    • http://duplicwcnj.space/62616241056s0xj0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sajififavaw.epizy.com/american_journal_ophthalmology_case_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/piwuranerezadowod.pdfIn PDF document text
    • http://nagurinetawami.rf.gd/xujodokujidarujefojesu.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/allegra_60_mg_bula.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_off0000f508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF508 5012 bytes
SHA-256: 9d3b4c860bbf0a136b2235d04c6253313d16529916452a1846b2c31eea161a80
font_01_sfnt_off00010638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10638 10728 bytes
SHA-256: d4b6ed2286b4d766fd6a507941fe4bf91291af5b669657d7242f7163ed5d625a

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