Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a08f68598bb6b36…

MALICIOUS

PDF

74.1 KB Created: 2021-09-14 04:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 278387ed01700d55e2c930dd9f8ed4cf SHA-1: 9ddf4f0cff3890a4fa90b89597233831aa614ab3 SHA-256: 1a08f68598bb6b366876c8511fff500e3ab6955e6d8bf371af38246de7d894b7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to potentially malicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used to distribute malware or conduct phishing by directing users to numerous external sites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://csp.hu/editor_up/5507600195.pdf In PDF document text
    • https://pt2-turbo-j3t.com/contents/files/loniguvajepojatipon.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b5e6765a1---pufop.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/30197210785.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/10780273681.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/83873278825.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/pupegezufiwomirijasafi.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/26598349386.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/70308482234.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/79997238214.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/65485564293.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/91353709741.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/59947940865.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/xakudunofoxov.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/31045853328.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/dokitubuwuf.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/gewamo.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/welanotuxotivud.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/fetemafagaguram.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/69252586075.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/weposanemironavisipetu.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/28560948406.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/rumapun.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/qim0d3ju4jsbjqqmldt7bqtma1/dojudigu.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ramoxebixabevezowanugekab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=glu+coins+hack+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_off0000bd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD63 16916 bytes
SHA-256: 0d8f3c770ab683d83ed20115708cf4ec6ce64c66b5be0253667772016fa1e2fd
font_01_sfnt_off0000e8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001010c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010C 10600 bytes
SHA-256: 6770884857ec0989c31c5d987452d8e4a5763c9c87ad161373e11fc40bc9cfe5