Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ebb341fad942d4…

MALICIOUS

PDF

71.5 KB Created: 2021-09-21 21:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f264508c27cb8c029ba1fae17ea6a29a SHA-1: ac1d530ddb7e9faa868edd4835e4f1782f87e614 SHA-256: f1ebb341fad942d4543326de1574c3edb9e16517b13fbe9e6c79a65db72d566c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous external links, many of which are on disposable domains, suggesting a phishing or link-farming operation. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' point towards a campaign to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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://infrive.ru/uplcv?utm_term=number+neither+prime+nor+composite PDF link annotation
    • http://www.andreapondika.cz/file/sebipuwonuliwutuwoxudat.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/81908447769.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/38215697658.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/38851018922.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/57942560649.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/pukevazili.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/mipasunenu.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/kamewidepin.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f50a000477---79011446591.pdfIn PDF document text
    • http://toroisg.com/public/images/files/zuzulefukemujiku.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/duvemegidikenizidixapevik.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/lozevupavoboxuve.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/48758162226.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/25879039177.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/96962742849.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/d2b3d11df33db04084b9682f16222c0d/96215509597.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/pivolano.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/83217723615.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/duwomoriwazuresojarebupo.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/fuguxafasogudezopakanus.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/39410052020.pdfIn PDF document text
    • https://sharenkon.com/files/83299693824.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/9683003701.pdfIn PDF document text
    • 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_off0000b7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBB 15824 bytes
SHA-256: dc7798688f67351e770b959844a4a870af268a0a352f702bea313b5e9784a1f3
font_02_sfnt_off0000f811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF811 10648 bytes
SHA-256: c10feef9bcc5e40a03d75aba2ae85541d25074fc1eaa8ac3c698f62320a43ed5