Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe32fd8f9e86f63…

MALICIOUS

PDF

83.8 KB Created: 2021-09-23 21:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 536ad59c0534bcc528809e32ccb203e8 SHA-1: 320692614b3e66d30093308836e77781529ba6f9 SHA-256: cbe32fd8f9e86f639ff780dffd23bde49c1caec6c8d6ea401cfbbd5efc87511d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to PDF files on various domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/0f8eb027b0f5e3492f5e1f42ae2347ea/22530113785.pdf In PDF document text
    • http://dakhoanhanai.com/images/files/52746078796.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gagisixuwenojitulate.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/4184898098.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/tevatorifunez.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/wedajupulozokajarizunof.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/xezunulo.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/gigufi.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/sararenokirorosigedisixux.pdfIn PDF document text
    • https://btegypt.com/file/femirojuni.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/91160196728.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/zugotapevagotikito.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/lukoderadop.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-13/20210913135426931486.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/79655027686.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/12763973465.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/jukazagomafilabugupefezu.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/30279571328.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/23537752937.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/81706254421.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/jusap.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/runajes.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/tovibujegufisapitupaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+read+pdf+files+on+androidPDF 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_off0000e2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD2 18104 bytes
SHA-256: 148c1dd94cef4af45e4504deb195c3f83c03044e33493de4063e339eea0971ca
font_02_sfnt_off00012941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12941 10568 bytes
SHA-256: 5c62f586610e8b519996f7ef5de0aeeeb6755d79c26fefef130a5743d1012feb

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