Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce75d3cc5e3c724c…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 23:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b0258f7a7199648c5ad5c1fccb31102e SHA-1: 82bd1ddb5342eb7bc3c78d4cc5c19610bd3bba1f SHA-256: ce75d3cc5e3c724cf7b20d0f0065f0f2a4e3472e5425acffba78e2aafbf4cfa7
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and links to external URLs, some of which are algorithmically generated and hosted on disposable domains, indicating a phishing or malware distribution attempt. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests the document's intent is to socially engineer the user into installing malicious software or extensions. The ML classifier and ClamAV detection further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sdhouse.info/ckfinder/userfiles/files/ginibaxa.pdf In PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/vololejerejetesenufi.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/gojut.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/4782180540.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///66075087256.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/30679282256.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/74131697057.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/13717113704.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/58933396839.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/nives.pdfIn PDF document text
    • http://cartopack.be/Images/file/73100767765.pdfIn PDF document text
    • http://contelex.it/userfiles/files/tuguseve.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137a183975ff---81724861766.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/mimidenida.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/zomoz.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/kajobogij.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/7980228017.pdfIn PDF document text
    • http://js-space.de/userfiles/file/4610629850.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/43875092818.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391e08ebbc6---sotib.pdfIn PDF document text
    • https://labelmarket.pl/data/file/mosivutupasuvujon.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/37975341983.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/67485603348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=0+to+1+peter+thiel+pdfPDF 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_off0000e4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDC 10240 bytes
SHA-256: 7ba3f1e110f09645c4287864245be894fe7a5f72f28b5b7cde48469caac43a41
font_02_sfnt_off000113e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E2 17696 bytes
SHA-256: ead182c657f79633875f9f9962c264f02b76070c7de6ff7691cafb015d1fd17d

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