Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16527facd44ca40…

MALICIOUS

PDF

72.4 KB Created: 2021-09-26 01:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2baf15dda2c087906799fd07dce86156 SHA-1: 7f9a6637d1c46e25a86be095131e4771e7793448 SHA-256: b16527facd44ca405cc972db4fe40b8193903cf2802e5bbe4c2e7b2c789f86e9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. 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 hosted on disposable domains and employing UTM parameters, strongly suggests a phishing or credential harvesting attempt. The PDF's structure and the embedded JavaScript indicate it is designed to lure the user into clicking malicious links or executing further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pixomot.ru/uplcv?utm_term=how+to+see+if+someone+visits+your+instagram PDF link annotation
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/8e398ce0113f52e3517ddcf8cd303bd7/ramuditekebiru.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/2031318660.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/fipipebojew.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/nozilolojobadoriw.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/52a23e4ca0e6a1d7cebccbc132df7e27/67317912194.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/mutuwifa.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/4026015693.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/10324457887.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/89797047843.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/55707221011.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/40974784642.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/tujujuf.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/20537445917.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/56657654587.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/zosibowidoxojitodawamo.pdfIn PDF document text
    • http://happy-land.hu/editor_up/97500047452.pdfIn PDF document text
    • http://poorclarescork.ie/images/97350090963.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/viwabarikavosagiwidit.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/86874176466.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/835099347.pdfIn PDF document text
    • https://norservis.info/files/files/dizijeputukazizurutabojig.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/linebiwurexifulewibumanu.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/43661929048.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/pagif.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/xaredo.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_off0000b5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A3 17292 bytes
SHA-256: ff4d878b9653430d0f9d2c701e972c5337298de18d763ed3e0bf223457b4d8eb
font_01_sfnt_off0000e226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3D 10868 bytes
SHA-256: ae686c89ff1c16ad0cf5b0f3d04be5fb2c0796ad43a9c2aed2bbfb3a72651256