Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea7d7c75f1fd438…

MALICIOUS

PDF

72.5 KB Created: 2021-09-15 19:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a04be076fd1ecc46e0dc7414c903aeb6 SHA-1: 83b509f3ccc03b029184944827c3873ad1a6d5af SHA-256: aea7d7c75f1fd438bde8c51db71daf150283dd50aa66035e238b4db5d1fac13a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs, many of which are part of a link farm on disposable hosting, suggesting a phishing or scam attempt. The presence of embedded URLs and the nature of the heuristics indicate that this PDF is designed to redirect users to malicious websites, likely to distribute further malware or steal information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 5

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=play+store+app+update+2020 PDF link annotation
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/48574822723.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/batix.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/20714298514.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/40861531585.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/b40cb2590c13ba0bdfe52b6fc7b95fd8/8378580922.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/bivofafula.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/20794321983.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/82466487006.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/miwewedulusivef.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/toboza.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/jitarimerol.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/92851558985.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/78996893302.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/7g9sv2r5hii7upftbs841pomba/vumomojigagogup.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/pirilap.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021922324271312.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/85565814092.pdfIn PDF document text
    • https://goodline.by/userfiles/file/89752363954.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/47405057183.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/nutexubanaw.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/gepili.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/mogivedotagilikozo.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/7333914514.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/79940229840.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/seves.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/10576040057.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_off0000bb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB78 10648 bytes
SHA-256: 486af9603692420fd1d413a9963edac2a4d6302e797cd672f9cd63ccd0dc23f3
font_01_sfnt_off0000d423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD423 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC35 15684 bytes
SHA-256: d0a52bd42e5806d911b05b8a8127191d79167f7d849d79246cea29fa876e8502