Malicious PDF — malware analysis report

Static analysis result for SHA-256 af645dcbaa5000fd…

MALICIOUS

PDF

70.8 KB Created: 2021-09-16 19:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c847893d5c383a207e26461a6627b1cb SHA-1: 3d9f19c77fbbabe2609b9c20057fd98d78e684f5 SHA-256: af645dcbaa5000fde0db6550fedac9f66b344660fe23d5a745dce0eb2b308aa8
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 delivering malicious content. The PDF also exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, many of which appear to be disposable. This suggests an attempt to obfuscate the final destination, likely a phishing or credential harvesting site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/76451172518.pdf In PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/10377936695.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e4057c3d0---tazak.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/jusenekoropixef.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/3190953259.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/xuluputarutawon.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/15074441235.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/49566613822.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/71181306454.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/surip.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/57165673209.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/87807740333.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/11172523456.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/3038416487.pdfIn PDF document text
    • http://onelove.cz/file/46140096013.pdfIn PDF document text
    • https://riwg.in/userfiles/file/5061684155.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/rixovumimosozuwadu.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/kirukemevirifudib.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/30317806348.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/pftm43tfdtf4887o471rsnhn66/32170334783.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/migerofejogitibirite.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/49406389882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+do+i+delete+trash+on+my+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB396 16240 bytes
SHA-256: 0312fc75790680c05bff9efe412857ad0c7ef41cf559fa30967fe8c2ef3ca248
font_01_sfnt_off0000dcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEF 10704 bytes
SHA-256: a1dd71431ab9e5fad973d996b18c3cc8b6a6dd5c34c31eac555489e976386604
font_02_sfnt_off0000f54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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