Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c4e36a237ddd18…

MALICIOUS

PDF

67.8 KB Created: 2021-09-25 11:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8447aa3c5924e97798fd6a19eedbfa40 SHA-1: 81abf636170f1a9dbb7615fcffe525a8065381cb SHA-256: f5c4e36a237ddd18804c531878f0a4081e0fa1da973169235ce1ae311689a9f8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external URIs, many of which point to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://vitanov.rs/files/81341126636.pdf In PDF document text
    • https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/46324832174.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/mezevavobesudedise.pdfIn PDF document text
    • https://sanagustin.cl/files/mowumubabugufofotijonum.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/fuxopaguwu.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/xunixo.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/54731932423.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/85194614077.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/lewerosawosom.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/giwajolometuvapojexi.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/31956367146.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/18074526314.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/libevadudopi.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/50395428299.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109151202133688.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/wotiguxisasuzeba.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/v2uu4rqgh5klfr7e69sb8vgqm4/1715489176.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/xevegovanadivokuzatav.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa64236925---62540850428.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/48455404694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+force+restart+iphone+6+without+home+buttonPDF 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_off0000ab67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB67 11184 bytes
SHA-256: e09439d7a4b67142e6b62cb521d8d0c85d17ac1f0d6aa69f6228ed8b8b502572
font_01_sfnt_off0000c539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC539 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4B 14648 bytes
SHA-256: 8e3c91d638e698882dcd3c013e13f8f8781ae41f3002265bb8ad76a5e4d44d94

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