Malicious PDF — malware analysis report

Static analysis result for SHA-256 872d242b719947c9…

MALICIOUS

PDF

94.8 KB Created: 2021-09-21 02:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64176e15bf9b6c344e9f56740e0b06fd SHA-1: 9d221ec3039e40a8057fe981591eff97e316185d SHA-256: 872d242b719947c9a48a6b7d58e7e1aa98d185705f3ce69c92fd007a09ef7c23
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is used to host a large number of links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.farnostbobrova.cz/ckfinder/files/34747513858.pdf
    • http://areawifi.com/DESARROLLO/userfiles/files/79643069592.pdf
    • https://suacuachuyennghiep.com/uploads/files/29708946117.pdf
    • https://jungleflightchiangmai.com/Uploads/files/kebaduxadapagowisatiluseg.pdf
    • http://taispacedesign.com/upload/files/rinivemexi.pdf
    • https://er-cardiff.com/eurostyl/photos/file/ginifo.pdf
    • http://locum-system.pl/userfiles/file/vakupot.pdf
    • https://12shio4.com/contents/files/wujikilusavizadonovisuma.pdf
    • http://eiak.org/upload/editor/files/95995576591.pdf
    • http://mnarch.it/userfiles/files/velatewipamusaxe.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/9bd6bd8edbaf75b8f1e9a093df45af06/46254057721.pdf
    • http://hstechno.com/userData/ebizro_board/file/sijewunenuwasusija.pdf
    • https://pharmnet.cz/ckfiles/files/files/4360886520.pdf
    • https://fortworthdental.net/cmsCart/upload/file/22399766544.pdf
    • https://apskarota.org/userfiles/file/19357021055.pdf
    • http://lejuriste.ru/files/file/pezesatekigo.pdf
    • http://hangtatmj.com/userfiles/nekojabepegejepetefesakes.pdf
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/30477368927.pdf
    • https://wendi101.com/userfiles/file/difipusosivozelokak.pdf
    • https://decoveinvestment.com/userfiles/file/pamexibolumewewozuzi.pdf
    • https://hotelindigha.com/FCKeditor/file/lotimexekatiwixiba.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161348b509975c---retinexa.pdf
    • https://rubenferro.com/userfiles/file/xikopivotapewuzitimozeza.pdf
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/dozoxetijeborat.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=bloccare+aggiornamenti+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ff1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF1 16792 bytes
font_01_sfnt_off00012803.bin
478da3a007824029c50130bd7efc1b2c18cbdfcf07c8994803689d2bcf8bf0f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12803 17360 bytes
font_02_sfnt_off00015560.bin
14aa043f6e118114d26dc4bae078aea45ce795c17a85c1344f942919b68fbe86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15560 10596 bytes

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