Malicious PDF — malware analysis report

Static analysis result for SHA-256 1deaddba88b4956d…

MALICIOUS

PDF

75.9 KB Created: 2021-02-12 20:43:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: fac1e9daa30b6a5004756cf8cdcd5732 SHA-1: f13cbcea18fc0879fa06747d0fb9b3b444445028 SHA-256: 1deaddba88b4956daf14f7453cb348b7e0741bd3fde8b87d8fda98093f5f0c2b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a characteristic of link farms used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata related to PDF generation, suggesting it's a container for malicious links rather than user-facing 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://druttle.ru/wix?keyword=3.5+applied+statistics PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456728/normal_601a1e915551f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460975/normal_5ffc1e7e3dd4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501654/normal_5fe239495c2ce.pdfIn PDF document text
    • http://btsworld.org/460062961388jj6l.pdfIn PDF document text
    • http://itanah.space/ditulujosixamoxikawogexfs7ax.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/x0Nhinl/57648988794.pdfIn PDF document text
    • http://labincom-med.ru/219620047530ktvo.pdfIn PDF document text
    • http://elerctum.org/bessie_head_the_collector_of_treasures_text4d7cv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421036/normal_600a20b4742c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452837/normal_5fd9ada09eba1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393628/normal_5fefd7778cac0.pdfIn PDF document text
    • http://cmbespaceclient.xyz/netbeans_java_ide_android9vtwq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408873/normal_5fc68271b53f5.pdfIn PDF document text
    • http://atomyimperial.ru/blogspot_de_libros_20198ty61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471719/normal_5ffa5413aaebf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vapovalexuma.epizy.com/34910907081.pdfIn PDF document text
    • http://fujesotes.epizy.com/guest_book_template_editable.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_off0000e8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B9 5196 bytes
SHA-256: 9cd5080bcfff43e430cb9f040ada81121f8df33f79034bb5668ea80a07f23bf0
font_01_sfnt_off0000fa80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA80 11308 bytes
SHA-256: 0bd1b520ee93b2d9d2a52b8dc62fe68415afc9579e31ad6dda470ab37d500c42

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