Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e6260857e24d8f…

MALICIOUS

PDF

69.9 KB Created: 2021-09-27 06:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 07444e4de62e4641c73500328aea0dac SHA-1: 6fef86ce67a2b85fddd9c63285294149d338b8cc SHA-256: c8e6260857e24d8fe753e14fcd38dc20798ea70881b38ae9f2f24db2b904eee8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The presence of numerous external URLs, many pointing to disposable domains, suggests a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is part of a link farm designed to obscure malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://inwebjor.ru/uplcv?utm_term=rupaul+season+13+free+streaming PDF link annotation
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/kigufu.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/30479794653.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/gigokavunama.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/kumubi.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/fapukowefimoge.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/90272475842.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614658b66636c---xinidamiwuxanuleve.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/55999022381.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/foduvevajaf.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/24280332781.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/79128290618.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/kafuxaluvop.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/kupawilukogidokejofetes.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/nupomazileradatawof.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/95081365351.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/kazefobupabamefow.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210915180742.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/17670327125.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/54081030550.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/zejopujodutulixaju.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/ralefokolerelokimotekad.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/46644768446.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_off0000adef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADEF 16572 bytes
SHA-256: 41e5ace3cefcb47b0aa326535ca7db6b3c25e0ed1187aaae2384aa173d97d924
font_01_sfnt_off0000d834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD834 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04B 11068 bytes
SHA-256: 473a6bb753cfb66b61da21df79be0db72f788a69666046ff4ff9845da1ab4947

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