Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbbd02437b755771…

MALICIOUS

PDF

72.9 KB Created: 2021-09-16 08:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0c410cd5d4649f6853cd73dab54e7440 SHA-1: 0bafc603bdf2ec3719a54c657d3a3f8fdf1825f4 SHA-256: dbbd02437b7557718157e7df0b815987ff5978f2dc6a6b5eb4e7f582304671d5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious websites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=star+wars+kotor+2+for+android PDF link annotation
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613284412214a---56185819846.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/45256793783.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/barofavawa.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/d1987f805baa1676013c75913a7219dc/65418224657.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ead5e01dc---xizafulalidejepod.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/dugipinu.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/sipekamotuwoti.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/nafoxojavolabotowat.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210908054617.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/45288792223.pdfIn PDF document text
    • http://halaljones.com/uploads/files/48377946153.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/zibibiwomox.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210906_53C8D45936A9431A.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/95815445578.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/ravugegig.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/gesenimiku.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/28019011030.pdfIn PDF document text
    • http://stl-log.com/htdocs/cljr/data/files/fobabobawozuvopisexa.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/lerimapedaxugotivafuponi.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/pusinuvo.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/20690578340.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_off0000b7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD2 18028 bytes
SHA-256: dac139dda8824039833dffea72b2567af598ea6626f7c178154bf7b06be11c18
font_02_sfnt_off0000fe84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE84 10540 bytes
SHA-256: 39b5dbcf8dd8a51437da0e72ef7c212a19cb15a4c2d4f332ca60703b21fd29c3

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