Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e41397e39e9cfb…

MALICIOUS

PDF

74.4 KB Created: 2021-03-23 19:48:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9d8be4c051661aa387cbce4628e4180 SHA-1: 704be458a1cd345cb4b7e7c804fc65fdff0bf089 SHA-256: 24e41397e39e9cfb997bc896a767c734d90c69f21e74ab4eede4b51f60ed8fa5
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, pointing to various PDF files hosted on services like Weebly and iblogger.org. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and the extensive link farm suggest an attempt to redirect users to malicious content, possibly leveraging embedded JavaScript or other PDF exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/wix?keyword=gilgamesh+norton+anthology+world+literature+pdf
    • https://tifevijokob.weebly.com/uploads/1/3/5/3/135351552/jurazusa.pdf
    • http://mulisefetijasal.iblogger.org/10331630642.pdf
    • https://cdn-cms.f-static.net/uploads/4454547/normal_6036a007e6728.pdf
    • https://zutomivopisi.weebly.com/uploads/1/3/6/0/136051870/2affd16303ca.pdf
    • https://rezibaxuxemabu.weebly.com/uploads/1/3/1/4/131453555/08e5101da66d4e5.pdf
    • https://jirogadipew.weebly.com/uploads/1/3/1/6/131606393/giluf.pdf
    • https://gufogejerujog.weebly.com/uploads/1/3/1/4/131406717/fudeje.pdf
    • https://cdn-cms.f-static.net/uploads/4482854/normal_603a6598044cb.pdf
    • https://cdn-cms.f-static.net/uploads/4445104/normal_601b44e81d4ce.pdf
    • https://static.s123-cdn-static.com/uploads/4472221/normal_5ff2bade77b40.pdf
    • https://nidiladidubupa.weebly.com/uploads/1/3/4/7/134753920/40a252909b.pdf
    • https://rapowude.weebly.com/uploads/1/3/1/4/131454581/zavav.pdf
    • https://sumukekunazub.weebly.com/uploads/1/3/5/4/135400219/ninavemufo.pdf
    • https://fedalovojuxunod.weebly.com/uploads/1/3/0/7/130775560/nosagosoxizisap.pdf
    • https://static.s123-cdn-static.com/uploads/4452853/normal_5ff679281fb01.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kiwozoma.epizy.com/basanta_ese_geche_female_version_ringtone.pdf
    • http://puzasapexuwuju.epizy.com/gigifetumiluvaputes.pdf
    • https://s3.amazonaws.com/kawotexulozax/possessive_form_of_chris.pdf
    • https://s3.amazonaws.com/towutoginadivu/73916804333.pdf
    • http://zogufisuru.epizy.com/juvenile_justice_nsw_annual_report.pdf
    • https://s3.amazonaws.com/bojafazes/98137215637.pdf
    • https://s3.amazonaws.com/vaxebisapesi/kuradewadokovewiludedip.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_off0000e603.bin
6c80fcfe066cb325a6497157e1267dfe1866d9772f6ed18ef03450f769b3580e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE603 5680 bytes
font_01_sfnt_off0000f945.bin
c82585989e35643d8f65e67195846f0b97c935f2424dfbc052c4b232d01f9013		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF945 10144 bytes

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