Malicious PDF — malware analysis report

Static analysis result for SHA-256 81db9ab299138d3d…

MALICIOUS

PDF

79.3 KB Created: 2021-09-11 05:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c45b362bf388e37d75915fb87b3c2e2 SHA-1: a573f4bd8f7a0c77c1d2fedc7feb190de8073b53 SHA-256: 81db9ab299138d3d6de62e14689cc20811af8e2129c5e44953eb28768e729930
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to PDF files hosted on various domains, suggesting a link farm or distribution network. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a malicious intent to manipulate search results or distribute further content. No scripts were extracted, but the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 5

  • 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.
  • 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 http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130bf93ab23f---zosenilelesipoxexanam.pdf In PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/kadis.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/80873470897.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/57268826309.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613adeed293db---23445202247.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/42157463012.pdfIn PDF document text
    • http://qzgj.cn/upload/file/37246444994.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109070058298521.pdfIn PDF document text
    • http://kahasat.cz/data/file/bevupako.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/siwamojamepusaw.pdfIn PDF document text
    • http://z500.si/files/fokikubikim.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/81806325477.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/89066066155.pdfIn PDF document text
    • http://toroisg.com/public/images/files/miponekul.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/kejafovezuxawivegi.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210901_3CFA9BF29D9E5ED9.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210906193133.pdfIn PDF document text
    • http://erdbau-rauch.at/53713555889.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109020449148498.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/nimibalizefuraxibobutito.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/govonogetomaxijamadodanir.pdfIn PDF document text
    • https://ags-car.com/upload/files/71617960378.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/64045905676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+create+a+file+folder+on+androidPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD237 17904 bytes
SHA-256: df4cc9a17d0326c19799c7ebdc9d32c3bd0af541456d195db4e43522c5717bd2
font_01_sfnt_off0000ffe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F9 10376 bytes
SHA-256: b67c5fb6e0dd3b8b4370594ae5302b7518c00c194879f9c6336f3d91defebbb4

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