Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea25c2e7ce0231d3…

MALICIOUS

PDF

77.4 KB Created: 2021-03-19 17:52:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2f86b453084e3c6eaf5d6baaab872cc5 SHA-1: 59161e35ab48063b5e47d4f7f1ace3e2d6b5691d SHA-256: ea25c2e7ce0231d34b3ff752bc0329bbd0af10e9654d1d480124589466e86bfb
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dafemum.ru/strik?utm_term=oral-b+triumph+4000+electric+toothbrush PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490364/normal_60315dd8ead60.pdfIn PDF document text
    • https://vabadagijuruka.weebly.com/uploads/1/3/1/8/131856539/948520.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449622/normal_6011b74b616ea.pdfIn PDF document text
    • http://losopefopamusoz.sportsontheweb.net/ronereze.pdfIn PDF document text
    • http://zodelem.mygamesonline.org/timijokitigoja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369774/normal_60188c79214cd.pdfIn PDF document text
    • https://jedexapotup.weebly.com/uploads/1/3/4/4/134472831/salivafijowa-sifikagomo-kasumoraboj.pdfIn PDF document text
    • https://bupefozatige.weebly.com/uploads/1/3/4/3/134384552/lupuzawuxogasoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368969/normal_5fe5eacbbc722.pdfIn PDF document text
    • https://menosakisidibus.weebly.com/uploads/1/3/5/3/135391165/kovibaset-nopug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478928/normal_5fde66b94d61c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490132/normal_602da3bbb001b.pdfIn PDF document text
    • http://motarojetox.sportsontheweb.net/jemidisijefovenepusasaw.pdfIn PDF document text
    • https://vasinurevesodux.weebly.com/uploads/1/3/4/6/134605286/gowulobojizo_desifurobeden_lonafevujonunu_sunazib.pdfIn PDF document text
    • https://sewimoranekodov.weebly.com/uploads/1/3/0/9/130969375/tadusogopafilu.pdfIn PDF document text
    • https://tulebowad.weebly.com/uploads/1/3/4/4/134467329/nogeso.pdfIn PDF document text
    • http://fekosuse.getenjoyment.net/garusugumurejitigidunodu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464311/normal_601332d04bbbd.pdfIn PDF document text
    • http://lamaded.mywebcommunity.org/what_does_an_er_physician_do.pdfIn PDF document text
    • http://gagitevanonuti.mywebcommunity.org/18136410430.pdfIn PDF document text
    • http://nekidifuton.medianewsonline.com/fenimexiwogef.pdfIn PDF document text
    • https://saredikov.weebly.com/uploads/1/3/0/8/130874194/makomipakaromaw-xepuxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500189/normal_605265dcc1970.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vekemelegewimo.atwebpages.com/comment_faire_une_bibliographie_d_un.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_off0000efea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEA 5604 bytes
SHA-256: 3d77db8e31ed836b2ac1dea8ad5457ad9fa2de56c0a706014ab74c2a7950fb0f
font_01_sfnt_off000102c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C5 11032 bytes
SHA-256: 1c39d9209b4b56380fae78fd2eee5f149c6198491746d3117c06e2f56b39778d