Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a42ccc5ba5e7bb…

MALICIOUS

PDF

76.5 KB Created: 2021-09-24 22:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9440aadfd89690b6d9a3f646cfaddb8d SHA-1: 9d11da9eaa5b505223cdbbe9f69f801f6357b5a7 SHA-256: 92a42ccc5ba5e7bb3826719861397c8f6f95f8b6afcb804ebc13e509a8d47236
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm with numerous disposable URLs, suggesting a phishing or malware distribution attempt. The document body is unreadable, but the PDF structure and URL analysis strongly point to a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 https://icnj.net/ckeditor/ckfinder/userfiles/files/57405286523.pdf In PDF document text
    • https://aynispirit.nl/userfiles/file/23117567181.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3aa82becc---xugunaxakifot.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/kazexusiteso.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/rotujumibuwukidurul.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/92474068928.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130695878412---fowumexabidakilizevo.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/goponi.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/tunuxoxekulebu.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/65002184117.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/17315902287.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/44478353547.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/lojumakedeki.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/72956042824.pdfIn PDF document text
    • https://btegypt.com/file/kagikonelepob.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/bamimixajebejakizafiko.pdfIn PDF document text
    • http://goldia.cz/data/file/vozadebatatanuzamanegoxus.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/603673049.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/tanevewurimifuganuw.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/gozulivezunenejides.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/88013868165.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/69840285902.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/16354753226132fd60d18f6.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/xafudemijazefavun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=among+us+hack+always+imposter+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB446 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC57 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_02_sfnt_off0000e22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22C 15428 bytes
SHA-256: 08b2ff50ffb1bc7ff518e58b6186b0a11d3c2a3848601fc81c35ec63f9b26390
font_03_sfnt_off0001090c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090C 11336 bytes
SHA-256: 5db16c2b1b4a6931ebc759b9003d7d6c9ce314f80bb2f6b3f75fb8438e8d2ab7