Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56e8168f51fba96…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 03:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ae8952acdbf3faabc4f0fbaa91d785cf SHA-1: e5677e28617594fdb8fadd1cb4f9d9488615d697 SHA-256: d56e8168f51fba963fb319da74ef32de47ff789739e6e556616572af55fd6843
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. No scripts were extracted, but the presence of multiple unknown URLs points towards a content-driven attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://grupposcorcia.it/userfiles/files/zizuxesunasovavosipinofa.pdf In PDF document text
    • http://discus-rus.ru/upl/file/molajaxemojaxadigodimolu.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/4856779047.pdfIn PDF document text
    • http://arablift.net/userfiles/file/72357653535.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a9572cfc4---kemixuxi.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/nigexusidugetitizus.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/vufipox.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/93471851036.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/soxubo.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/boboromefipogel.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210902075304.pdfIn PDF document text
    • http://wdnederland.nl/file/tezevozifi.pdfIn PDF document text
    • https://fasleh.net/Files/files/bowurosopadukinuve.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-4/20210904225743617242.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/76480960350.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/boxonakona.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/99639275348.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/buwamulupiliworomet.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/40385625798.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/vuvifat.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb779933a3---63043149934.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/nibuvesemulujuzekosulu.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zasevizipalijudaraki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ios+emulator+for+android+apkPDF 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_off0000dda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 10804 bytes
SHA-256: 397fa6b07e029ccb9d64cc37b43c3bb4e4e13e83b006ac6425bdcc5cd6c3a4f8
font_02_sfnt_off00010e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8F 18492 bytes
SHA-256: 8f31aa30290c38cd4bc23812e291775f11f34ef6ba4bfdc7d55fef1954c230e0

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