Malicious PDF — malware analysis report

Static analysis result for SHA-256 580396e3a3b3ea45…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 01:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b602d939a250fe7eba61942c1566afc4 SHA-1: d76e958604c629a6cd5836094537e044a14651a2 SHA-256: 580396e3a3b3ea4587d4acef951947580a8891d989d0827e21a63a78cd284ac6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://wonsakai.com/uploads/files/duwosifadixusi.pdf In PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/43983696241.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/93783584266.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/17442305271.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/59721671232.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/xololul.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/18039494061.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/jobajuropesagevofifezepi.pdfIn PDF document text
    • http://elpijisystem.com/file/duzodi.pdfIn PDF document text
    • http://live-net.it/file/lizosikewiravajoxe.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/49667197209.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/wofomexuxi.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/9230918732.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/mavejo.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/66554775484.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/gekomitawapidixawafolaga.pdfIn PDF document text
    • https://pepsima.biz/files/file/sotikekalalu.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/lajowuvawivopuko.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/80913548328.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/62339888818.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109070244464566.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/mokagoxepobaxowozigoza.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16143bd155bed6---sovez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=list+of+mechanisms+in+organic+chemistry+class+12+cbse+pdfPDF 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_off0000d774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD774 11448 bytes
SHA-256: 265863d95ade0b11a677be09a6e736b3b847fe3a9e2300ce252db468fad4358f
font_01_sfnt_off0000f205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF205 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A17 18204 bytes
SHA-256: 3a59bce17e7c568c98de67dbc7b102dc198c167c5dfa44972116b2edb764970d

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