Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8a3a9d6143c4f4…

MALICIOUS

PDF

68.3 KB Created: 2021-09-27 04:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 77fbbb99f77bf33068c3da5c1e7d72ca SHA-1: c5aa27cd9cc85994e13a50e0a26a1511b019b4fe SHA-256: 9b8a3a9d6143c4f4a8215bed1df2c8bd87bd8ddd60090933273101dc6472803c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many of which are on disposable or link-farm hosting, strongly suggests a phishing or malware distribution attempt. The ML classifier also indicated a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://pistant.ru/uplcv?utm_term=download+prison+escape+mod+apk PDF link annotation
    • https://semot.com/Store/userfiles/file/popesenutitafemolobavubow.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/84758000520.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/xizofifaxidumozizeja.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/betuniniripasimipukekana.pdfIn PDF document text
    • http://chirineli.com/img/lib/file/65756758484.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210921035013.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/bojeposapideze.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///16124850019.pdfIn PDF document text
    • http://warehousetraining.ie/images/rivuretokonoz.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/87189634409.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/30378644139.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/dineraripa.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/10038276009.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/towenasixonixagu.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/zoxop.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/mowog.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/lufubosurolukigedukodudab.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ajpbk88rbak33mvgfs90n3kmve/27346954833.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/fowulajenasixetudojif.pdfIn PDF document text
    • https://tch.lu/files/files/tewopar.pdfIn PDF document text
    • http://linker-apps.com/files/91632244353.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/4615162700.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/43376098221.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://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_off0000adb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB2 14928 bytes
SHA-256: b7b06b414acfc24aa4b4b85a47ea4436b5d6e756377b140185607c5732487306
font_01_sfnt_off0000d320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD320 10756 bytes
SHA-256: ebe4e8ef693854a6bbd5b30e9bd292127012fadef167afa38ee90cf98428592c
font_02_sfnt_off0000ebd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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