Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7f3f919b093b11…

MALICIOUS

PDF

96.4 KB Created: 2021-09-16 16:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2fc36052628257688abc067609b09b8d SHA-1: bec9feff74f5dae7c90eb28ec09a4813ac3a18ed SHA-256: cb7f3f919b093b11632dc6a118ec84cd0b7fdf5b09e496b48403cddb67b67a25
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external URIs, coupled with a critical ClamAV detection for 'Pdf.Phishing.Trojan', strongly indicates malicious intent. The PDF appears to be a link farm designed to redirect users to potentially malicious content or facilitate the download of additional malware. The ML classifier also flagged this PDF with a high probability of being malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bak.vn/upload/files/53299305394.pdf In PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/bemofu.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/18126798770.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/90754705345.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/26844961468.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/sapomizobonugaj.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/banukifemezijufaj.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/witifenopadobebu.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/15961006568.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/zigutegibe.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/vasatipevuvozizupafe.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/zitej.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/31507659841.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/gewegemude.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66005417688.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/7820391883.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/narofovufumagunerikuzix.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/zuvodemoni.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613389e7b580b---zotanirarasivupiz.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/26632718537.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/98023476058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ios+ui+patternsPDF 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_off000110b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B8 10248 bytes
SHA-256: 56fe450fe313a7488a07e49a778a2d0a1d29c3d423bc6034704189a37e1d3013
font_01_sfnt_off000127e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E2 19832 bytes
SHA-256: 8d18664ee9c4a124e583e9fcf293e4f1da3f17f867a9973beb5cb2367d391abb
font_02_sfnt_off00015c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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