Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe858ebb9c1baf57…

MALICIOUS

PDF

100.6 KB Created: 2021-03-21 00:43:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b604a6ce01e619e6ebdaf133e7b73885 SHA-1: 28f842c8e769152d04c8d1cc918711495e0d75fd SHA-256: fe858ebb9c1baf57661ce97b1d6653b95a8d0b757e8aab774e31d2f90e8a75c3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/award?keyword=list+of+anticancer+drugs+pdf PDF link annotation
    • http://juwoniki.getenjoyment.net/99434655387.pdfIn PDF document text
    • http://pejokepi.mywebcommunity.org/34428376966.pdfIn PDF document text
    • https://basupetuwesaf.weebly.com/uploads/1/3/0/7/130739706/xajavasike_kanomin_muwixoponuxuj_ruwewekuxa.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/X3jaxrZ/wusomawejimunef.pdfIn PDF document text
    • https://cdn.sqhk.co/kufomopinu/PiejbL5/85348592981.pdfIn PDF document text
    • https://rarasaxemog.weebly.com/uploads/1/3/4/6/134611000/lakexonegide.pdfIn PDF document text
    • https://cdn.sqhk.co/givifevulo/PMghjhP/26025056066.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/agdjbgf/your_guide_careers.pdfIn PDF document text
    • https://cdn.sqhk.co/siwowoso/ncLlMh2/7996636681.pdfIn PDF document text
    • https://mujesazuf.weebly.com/uploads/1/3/2/3/132302915/c0ea1fdfb.pdfIn PDF document text
    • https://cdn.sqhk.co/vavetiset/fhcNOhg/command_prompt_windows_10.pdfIn PDF document text
    • http://sadinexiwa.mygamesonline.org/3836938471.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/hd2ia66/52202300200.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_4780bf09da9c4afca2147593712ec724.pdf?index=trueIn PDF document text
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_8e22169abd8d4c08976e78c5d415db34.pdf?index=trueIn PDF document text
    • http://vilepobafomunow.atwebpages.com/tcp_ip_guide.pdfIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_7a6e0a4be6fa4e749c7b80a476e10ea3.pdf?index=trueIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_12b0c57e8b2f4be1a4d355422db94c48.pdf?index=trueIn PDF document text
    • https://a4edf7fa-b057-49b5-8014-e5fd436fbef3.filesusr.com/ugd/c8b2c5_ee61e2ca81344493b93d4a0bd565ab29.pdf?index=trueIn 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_off00014be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE6 5232 bytes
SHA-256: 1ce4919770b6da46787361969473e2aa96e94f0f70c558b382639658640c65fa
font_01_sfnt_off00015dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DCD 11664 bytes
SHA-256: 4db8745ad6e7668fce7e86f6a759cbfc0f73d96cf308c909d0d3c6d9cc8022ef

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