Malicious PDF — malware analysis report

Static analysis result for SHA-256 815cdd7619fcc144…

MALICIOUS

PDF

97.6 KB Created: 2021-05-06 23:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0004c7875d985c2b24fd5b421104c1b SHA-1: e97c66550e4b7e8f44b71f55958b20bba494d6b1 SHA-256: 815cdd7619fcc144f9144f1e872ba11fa35b70f79e3f751b81559dfd610105ff
194 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though obfuscated, contains keywords related to 'public relations graduate programs', likely a lure to entice clicks on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://botokaw.ru/strik?utm_term=public+relations+graduate+programs
    • https://goginaderexikez.weebly.com/uploads/1/3/5/3/135306094/bufojo-jedisuzesuw-bexabereremi.pdf
    • https://wazaxilam.weebly.com/uploads/1/3/4/7/134726650/devebod_kexurosudupori_patel.pdf
    • https://vudolipilenad.weebly.com/uploads/1/3/2/7/132741032/lujipotafefiwugem.pdf
    • https://cdn-cms.f-static.net/uploads/4460048/normal_606c579274e82.pdf
    • https://tulopudegiwidal.weebly.com/uploads/1/3/0/7/130739196/27a76935f.pdf
    • http://tijudozi.scienceontheweb.net/83182850467.pdf
    • https://vipukawolatu.weebly.com/uploads/1/3/4/4/134486161/6571616.pdf
    • http://instgrmmverifiedbadge.com/verbos_modales_en_ingles_para_nios3brza.pdf
    • https://static.s123-cdn-static.com/uploads/4414691/normal_60095727ec4b0.pdf
    • http://myfavoritesun.xyz/88263651498orl74.pdf
    • http://clipshd.design/stihl_ms180c_oem_parts48k2a.pdf
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/vozejubaduzekem.pdf
    • https://static.s123-cdn-static.com/uploads/4383802/normal_5fc87d1334208.pdf
    • https://dobuxavebixeli.weebly.com/uploads/1/3/4/7/134725246/pifim-fugofiwudowula.pdf
    • http://ideal-it.fun/veragivudeguwj8n4.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • https://wovuwujofisup.weebly.com/uploads/1/3/1/8/131856276/visewip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lavoxema.onlinewebshop.net/verbal_analogy_reviewer.pdf
    • http://jonesojawu.myartsonline.com/4537915744.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014217.bin
af8f384fcb226587493f5573c26dbc2c14a819155b8510fc516236693836e5df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14217 5536 bytes
font_01_sfnt_off000154c9.bin
ca550daa7b73e7f2d1246bd2b478dbad4cc3b318baaa29fc3d7942422be08883		 pdf-font-stream PDF embedded font (sfnt) at offset 0x154C9 10712 bytes

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