Malicious PDF — malware analysis report

Static analysis result for SHA-256 92900e077bb8b6dc…

MALICIOUS

PDF

88.0 KB Created: 2021-02-27 13:01:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 328ae4969e66fda251e7841501542156 SHA-1: 9c80139c2a9830e76abec3e6085f0d59f90f3a8c SHA-256: 92900e077bb8b6dc57bbe42a086907ae8fb6e4f1a4f111ceb8ccfb6fa7f42404
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting an attempt to distribute malicious content or phish for information. The presence of external URIs and the 'link farm' heuristic strongly support a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=how+much+is+the+band+inxs+worth PDF link annotation
    • https://cdn.sqhk.co/zubavagi/ggfijhf/junug.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/pleasure_without_conscience_meaning_in_telugu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422909/normal_5ff037304e80e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404121/normal_601fa8003a630.pdfIn PDF document text
    • http://katipef.medianewsonline.com/84409952116.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471692/normal_601f759332b96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404293/normal_5febb57376aa9.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/kakorivubefebok.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/MHicOjd/quote_coloring_pages_for_adults.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420592/normal_60384faa7feae.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/95826117170.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463287/normal_5fc62757ea455.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421943/normal_5ff258c19d37b.pdfIn PDF document text
    • http://modernstyle.pro/my_grammar_lab_advanced_c1_c2_answersw1f6k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gigitepusiligo.epizy.com/chennai_express_full_movie_480p_free.pdfIn PDF document text
    • http://kivozusemu.atwebpages.com/mr_heater_big_maxx_installation_video.pdfIn PDF document text
    • http://bimivopi.epizy.com/aluminum_sheet_rolling_mills.pdfIn PDF document text
    • http://numowun.rf.gd/13755481422.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B17 4008 bytes
SHA-256: 0008ca523c036646489ce4d144a13cfdd24be6c196fcc4594d241ead1ae7bb20
font_01_sfnt_off00011984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11984 5408 bytes
SHA-256: cf2aea00093e1f5405df5186f9da1123e16f6337e5b63561cf38cb71c397cf0a
font_02_sfnt_off00012bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD0 11356 bytes
SHA-256: 2e56d3d27aadc7ee08bb3d807b9778af5ef691777b2b28ab4ecbb775a354fad0

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