Malicious PDF — malware analysis report

Static analysis result for SHA-256 85864afe3aec95d6…

MALICIOUS

PDF

73.7 KB Created: 2021-02-18 23:39:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 31932724e574fbc1fa3ae3aa12a7d5e7 SHA-1: 694bf86307d9030878361d2abc9be6581deeb015 SHA-256: 85864afe3aec95d6774a0afccf6d4227fccd6709492c37f4a45237f64f383ed4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to disposable domains, many of which are structured as link farms. The document body, though heavily obfuscated, contains text related to 'technical communication book pdf download', suggesting a phishing or malware distribution lure. The presence of multiple external URIs and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to download further malicious content.

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://seumenha.ru/123?utm_term=technical+communication+book+pdf+download PDF link annotation
    • http://pokypka.xyz/perfume_recipes_with_patchouliy41eh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407998/normal_5fdd736bc2ba2.pdfIn PDF document text
    • http://wukosemat.22web.org/furevenudedujujad.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/qSijr7C/32906215754.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490974/normal_600a1f98507b9.pdfIn PDF document text
    • http://money-team.site/bumepoju60xgr.pdfIn PDF document text
    • http://tophomework.space/b._ed_syllabus40y6z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418993/normal_60088de943ba0.pdfIn PDF document text
    • http://daduriwikoniza.22web.org/bodedobilizugubiniwipadof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529893/normal_601b3e465e848.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446784/normal_601f604b1934e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bajebozirodiv.epizy.com/pigavozoboxixuvew.pdfIn PDF document text
    • http://vutegug.epizy.com/vagaxu.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_off0000e49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49A 5364 bytes
SHA-256: a80a7c43ee8dba1552224ccd0ac4bdae16ba7f85aa7777c32576031d00909a80
font_01_sfnt_off0000f6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C6 10236 bytes
SHA-256: 1f8d6e58537301bfa7cdf0c22b8c9334e480f8c1cfff9d71a4ffa829b7fa9094

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