Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b465611995e778…

MALICIOUS

PDF

83.7 KB Created: 2021-09-23 00:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 70a89cc4423096c65398688db15335ad SHA-1: 4db4da071e0ff1418ebeef222d7484d86467bea1 SHA-256: 72b465611995e7788fdae112af07c38ba94d273ef475ffcf7630d19f287daba5
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, suggesting a phishing or redirection scheme. The PDF structure and embedded links point towards a spearphishing attachment attack vector, aiming to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • 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.
  • 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://coretry.ru/uplcv?utm_term=disabling+developer+mode+android PDF link annotation
    • http://hzkontejnery.cz/ckfinder/userfiles/files/36848063140.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/bibelosonovuwujule.pdfIn PDF document text
    • http://liyangah.com/Upload/file/35573111599.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210913_ABD9D9DE567908B7.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/xodurabukurupazoput.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210919190330.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/4050621520.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/89777718904.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/25305669595.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/86838017415.pdfIn PDF document text
    • https://digicpictures.com/downloads/7966637200.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/7748591661.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/62112305957.pdfIn PDF document text
    • http://artio.pl/files/files/nikugowew.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/2430142003.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/1b435f9a7a80bee76d219072cfa33375/64795332158.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/befusudoliviwisetetize.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210911_004255.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/98721447091.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/botisupejopugulalajafinit.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210909_46FC30A6EE8F4A68.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/82386782956.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb0c59de08---sarofanopizoxuzodepugu.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/58862575338.pdfIn PDF document text
    • https://dacola.com/upload/files/vefinefanifeduwifuxap.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/52952061513.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/xaxukena.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_off0000e028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE028 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83A 18416 bytes
SHA-256: 434ce8449ecc4c6fffe53b3ee9765809c116555879bd7699975d9e23f539b802
font_02_sfnt_off000127e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E6 10844 bytes
SHA-256: e76fbf0f1c730440cd8fd0e708e24df84c92c790a819f6c877866898aca633e4