Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9a6a6fa7cf1afe…

MALICIOUS

PDF

96.8 KB Created: 2021-09-18 20:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3db0949add8d8528d28f5aeaca22716e SHA-1: e9c72219ab1a3bc15b23af852ed8ab9ac091e25a SHA-256: 3a9a6a6fa7cf1afe3310846937c4bdf359684aba062f226f51257bec9a43e017
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a high number of embedded URLs pointing to various domains, many of which appear to be disposable or link farms. The ML classifier strongly flagged this PDF as malicious, and the heuristic analysis indicates it functions as a link farm. While no scripts were directly extracted, the nature of the embedded links suggests an intent to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 4

  • 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://cructi.ru/uplcv?utm_term=moto+g+play+android+11 PDF link annotation
    • https://aslplastic.com/ckfinder/userfiles/files/kewederi.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/keredubovufedipawek.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/24095120022.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/debifulok.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091400385618.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/83003120944.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb481cce4---22030948981.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/9194508016.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/maralagimaxewovulijefi.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/jomagifezemuz.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/cih0ab14p9ftmgia7fbbcqvaus/fefugavajaranigekumitev.pdfIn PDF document text
    • http://deshpanday.com/ckfinder/userfiles/files/44312472282.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/gemuzabenatuzasil.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/lulijuliwe.pdfIn PDF document text
    • https://pkmoscow.ru/ckfinder/userfiles/files/vasubitavorevubefiz.pdfIn PDF document text
    • https://ratosatu.com/contents/files/61460334642.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/monajife.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/63735065352.pdfIn PDF document text
    • http://dothi.info/images/files/64822693197.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/javurudavatadop.pdfIn PDF document text
    • http://retailcop.ca/files/83530303892.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/xononorivadufo.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/fopof.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_off000115be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BE 10424 bytes
SHA-256: 651c43c3699beba8accb24c9ccfa856d738d9584a6762df165f61ea555438c3b
font_01_sfnt_off00012d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D53 18424 bytes
SHA-256: 80b2999f187a3494b447034742110b9fb54be8161dfa1b5074b8679d5e18783c
font_02_sfnt_off00015d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1