Malicious PDF — malware analysis report

Static analysis result for SHA-256 63fb5b977dc1224c…

MALICIOUS

PDF

84.4 KB Created: 2021-09-16 04:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3f9f4de366898a4e0cdb05614ee324cc SHA-1: 705ffba127c7c8746c52077bebedfd395920216f SHA-256: 63fb5b977dc1224caf9a146cb7557a529f5d8fe98e18891bdcc64a7efcf2589c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a link farm, likely to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://hsi-international.com/ckfinder/userfiles/files/13772737234.pdf In PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16142882f3a73a---98794663376.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/59567636329.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/linelolurivolefozukibef.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/jazugigaxovepul.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/55572591900.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/viberibinepog.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/gewapunuxemuwujipivenem.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/dotevamodijererodo.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/94992784847.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/22917944554.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/43291970134.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/57460507792.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/pedotex.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/walogugususobupuperinumo.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/lumikusojukivexopobo.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/tevusor.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f565130f08---ribezoxolawemalinag.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/jaxuduvamovavopegos.pdfIn PDF document text
    • http://www.pvvc.cz/files/86148486991.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7aae4b7de---24106829706.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/fonunidumuw.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/solububamanavomuwadis.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/bewido.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/dovalel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=wave+editor+pro+apk+downloadPDF 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_off0000e4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D9 10456 bytes
SHA-256: 187fe96168bd8a533417fd993841b7953552da28e1b3cf2a0219224c4cc5f3e7
font_01_sfnt_off0000fcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAD 18096 bytes
SHA-256: 6930d6a54f87a8168f6050ac97e75a706cd6933934e61f96245350e3bc6d6096
font_02_sfnt_off00012bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1