Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea864e4b2c02ada0…

MALICIOUS

PDF

79.4 KB Created: 2021-05-11 18:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bd80e4a3e317f420aee17d3f4eab4958 SHA-1: 07d171225df69e9abafea4b981dad385a74c390e SHA-256: ea864e4b2c02ada0ca72caaebc43c0cbb64d9b74ab35f78df7602a6860327280
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://baarspo.ru/strik?utm_term=does+starbucks+accept+cash+during+covid PDF link annotation
    • http://toluvubub.mygamesonline.org/lutoxedavimividomo.pdfIn PDF document text
    • http://vabenawak.iblogger.org/93170782809.pdfIn PDF document text
    • http://murezisafedamaw.22web.org/remington_11-87_cantilever_rifled_barrel.pdfIn PDF document text
    • http://rivozuzeno.mywebcommunity.org/dell_b1160_printer_cartridge.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392853/normal_5ffb44ce10868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384642/normal_603120f46c866.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444100/normal_5fe9efeed9594.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450141/normal_5feec6c29a0bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457014/normal_5fe44b2ee8c2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403820/normal_605d2f38b6de1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452852/normal_600bd21b61ea8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445534/normal_5fe0844e060b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369647/normal_605cebeb854d8.pdfIn PDF document text
    • http://pokovata.scienceontheweb.net/kinoxifefuzaxixudujukubo.pdfIn PDF document text
    • http://punejew.mygamesonline.org/gordon_wood_the_radicalism_of_the_american_revolution.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473410/normal_6048e2f229aca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nixomirorubu.myartsonline.com/efficient_r_programming_gillespie.pdfIn PDF document text
    • http://gerireg.epizy.com/povufovigeson.pdfIn PDF document text
    • http://lisiguzaxupego.epizy.com/xegakaxase.pdfIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_ea3ef2c079cd453a810fe20c3dd18be7.pdf?index=trueIn PDF document text
    • http://nijorirofebonin.epizy.com/29547112244.pdfIn PDF document text
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_21374b6ded84456d9ee332d159d872d4.pdf?index=trueIn PDF document text
    • http://rupesujutiwu.myartsonline.com/23877493588.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_off0000f391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF391 5564 bytes
SHA-256: 5e27d2502551db470f2aed9582a69b192666dcb3e0f12c8789ec82738995a71b
font_01_sfnt_off00010681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10681 11868 bytes
SHA-256: ce87c95853144eb8683f20a40144059578fc259fdb6affb9473c671cb53bbab0