Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36cbf95b394539a…

MALICIOUS

PDF

82.6 KB Created: 2021-09-23 17:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ef92c0033bf8181a9b03407967fdc3fa SHA-1: 3aa8b854b43dcc21e229dfd394d9cc1475628223 SHA-256: b36cbf95b394539aa2ae08ba1255e45827b6c27afe062fc5d761dc8670919f42
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, likely as a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://duszek-lasu.pl/userfiles/file/midagevamijewufijomuv.pdf In PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/91779154746.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/14081894909.pdfIn PDF document text
    • https://magnumattachments.com/ckfinder/userfiles/Files/8102873122.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/gimelolototolanefonajojog.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/54380904048.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/55776360458.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/99571128540.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/23436095861.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/50615393786.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61385859012.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/goxumowimarozanizegir.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/17850788148.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/rirufuvanijakosexid.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161317e58ecdab---35209032430.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/13965892346.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/93849603422.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/10636634239.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/6252106878.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/80703964434.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/zugexidegatowanefufata.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/91948381153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=nice+words+that+start+with+pPDF 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_off0000e019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE019 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82B 17172 bytes
SHA-256: 235b26c91152e3ae4e955eb598224e80cf43bf1f39516f65f66c46c0a1a177b9
font_02_sfnt_off0001246f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246F 10524 bytes
SHA-256: 4da5506fb352c7f94316243267f2aab19aff4d63c93d5cc933071bff28eb735a

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