Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d952e5e971bcb75…

MALICIOUS

PDF

87.4 KB Created: 2021-09-12 07:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4f4207c45c35ae04a65cfefb2fd7b65b SHA-1: 7cf6c13787c5ae8850c919f0bc96725dc9ba37a8 SHA-256: 1d952e5e971bcb7521acaafb8646a0fa6c40124d4ca6aee90b1d04584c10bade
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. It also exhibits characteristics of a link farm, with numerous links pointing to disposable domains, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of embedded JavaScript indicates a potential for exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://sandp-engineering.com/ckfinder/userfiles/files/29514599554.pdf In PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/lisiluwutozeli.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdfa9cd4c8---69656640894.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/pebepo.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/xiwofo.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1630742369.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/97556742150.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/metoweriju.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/kajasazaju.pdfIn PDF document text
    • https://songhong.info/userfiles/file/xirijigop.pdfIn PDF document text
    • http://punaide.com/userfiles/files/balewimomepizudojizi.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/gf85ad3vlckklo6n1mgbgvnsc3/revavuku.pdfIn PDF document text
    • https://msiutilities.net/documents/5051410678.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/jirupotivevun.pdfIn PDF document text
    • http://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/97410865946.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/45631159090.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/tajedodaworimesefajepiru.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/putodopuxomuset.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/81260113359.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/sisisibibukofibedemexev.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/bujipe.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/89461716725.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/jidonakil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=apa+7th+edition+format+wordPDF 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_off0000f18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18C 17948 bytes
SHA-256: 8dbaf8782e55089efb6dd89027a116321e4efb960845817f5bd37a503e1925d9
font_01_sfnt_off00011f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A0 10664 bytes
SHA-256: 9bf599dd995172b9c67a4419e6ac6a34378f298dc61d07a08bfe4c928b218cf5