Malicious PDF — malware analysis report

Static analysis result for SHA-256 695de411de8bfb36…

MALICIOUS

PDF

96.6 KB Created: 2021-09-15 17:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c29787ee01045cc509ec9d3267424292 SHA-1: 7aa2c49454c568efe7291237da0d63c141f36c90 SHA-256: 695de411de8bfb365643266350a38781a644102d2bcd6861850bb8f8b4c74924
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were extracted, the embedded URLs point to potentially malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48500428565.pdf In PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/kedazajewug.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/widemakinibafafagepuf.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/72341531629.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/junaw.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/42204639197.pdfIn PDF document text
    • https://nada70.org/userfiles/file/tezopoliril.pdfIn PDF document text
    • https://fotografski-studio.kost.si/userfiles/file/58066304217.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/xosonesisavupipulal.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321d75723a3---giduripogiruwedofevax.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/26511788853.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/liliwexuverixela.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/36530954943.pdfIn PDF document text
    • http://taigesw.com/upload/files/43772698506.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/xonuweregojurifuxulemi.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/nudulasalimanujuxij.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/degasifoxag.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/jagemolamajif.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/zajav.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/45311322858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+streetcar+named+desire+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_off00011252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11252 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A69 10684 bytes
SHA-256: c25cea28b572ac87d5893e4821e4e1beaaef49b86873f5b1bcdb426cb4af604a
font_02_sfnt_off000142b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B4 19120 bytes
SHA-256: c6c12811f145cdf7b8a78f2cf8287708dc6bfad33d9e56994eb77343e471f191

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