Malicious PDF — malware analysis report

Static analysis result for SHA-256 191ae46855b22ddd…

MALICIOUS

PDF

70.6 KB Created: 2021-09-13 14:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0e99717549c26b5f45320942b0d610a8 SHA-1: 808068ad7e178543a1195c4d2707a30be8945baf SHA-256: 191ae46855b22ddd24e2e04d8e34b534d019b8b854b56d92971bfb4ba8551021
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, indicating it is designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, and the heuristic analysis identified it as a link farm, suggesting its primary purpose is to distribute or host malicious links. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://carrozzeriardue.it/userfiles/files/48432789176.pdf In PDF document text
    • http://akvatoria.by/UserFiles/files/62668082114.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/90795342881.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161368c4b87de6---waxavawezegizupanuvo.pdfIn PDF document text
    • http://duef.ru/public/file/96852358433.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/xumawetikixele.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/zitoxitofitabukap.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/pebijejowagamigabejuki.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210906042501.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/wivubuse.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/zusiwutote.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/gezugog.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/biber.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/togugekatuzofilot.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/sawunusopipurol.pdfIn PDF document text
    • https://adikkedua.com/contents/files/jedek.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/xufajivipi.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/2720514177.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/ginaferelagapu.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/96301660623.pdfIn PDF document text
    • http://geraldinekilkelly.ie/jopakubo.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///25174011284.pdfIn PDF document text
    • http://mdtrend.hu/files/file/vojasimosodujisesikanaw.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/38622028969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+hack+someones+devicePDF 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_off0000b2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0B 16208 bytes
SHA-256: e3319232becba95282f17245b49784f438985279532e464480baa0b2b5ae9675
font_02_sfnt_off0000f3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D6 10724 bytes
SHA-256: 6b81239c46b2c826c518c47930fae7d8b53c531e5fdb6dbfc88125c02164801e