Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ddf8e936140c5b…

MALICIOUS

PDF

137.3 KB Created: 2021-10-04 15:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ceaf0afd7b23fccbfcc3d481943098b SHA-1: 8afa4cb43d2cf46c1d2008245c69dc6ef450c01b SHA-256: 21ddf8e936140c5beb87c328d19abf43b2482f586180d30eaaf35d68d3decbcf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or serving a malicious payload. Although no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://studiotecnicoarduini.eu/userfiles/files/79992706505.pdf
    • http://tonioloclaudio.it/userfiles/files/78836906806.pdf
    • http://eventechsite.com/files/files/92918578970.pdf
    • http://onlinetradeshow.ir/uploads/files/dinunewopewulokolewid.pdf
    • http://www.polni.si/Images/files/dipimemalosugupofinowifa.pdf
    • http://gorod-r.com/userfiles/file/39678211493.pdf
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bovad.pdf
    • https://signos.larrialdiak.es/files/galeria/files/76175012446.pdf
    • https://detmers-kontejner.hr/files/55966116393.pdf
    • http://npi-management.fr/ressource/site-image/files/99930355802.pdf
    • http://tjchenxing.com/filespath/files/20210906075219.pdf
    • https://bloomland.com/sites/bloomland.com/files/25956437098.pdf
    • http://wonsakai.com/uploads/files/81330354777.pdf
    • http://taiwan-tsai.com/upload/files/94465409816.pdf
    • http://xahscw.com/userfiles/file/84618275453.pdf
    • https://piti.leaddeehub.com/userfiles/files/xiwevuboverotom.pdf
    • https://ctyhoanongangiang.com/userfiles/file/24881754406.pdf
    • http://househouse.it/userfiles/files/36453866795.pdf
    • http://domario.ru/userfiles/file/88326531543.pdf
    • http://cabinet-blin.fr/ressource/site-image/files/lupagufimugata.pdf
    • https://edarky.net/data/file/dopegegabatuvesobum.pdf
    • http://amirafouad.com/uploaded_files/file/xokowuf.pdf
    • http://lagunaapartman.hu/images/user/file/fananojaxifiruf.pdf
    • https://soportedevida.mx/ckfinder/userfiles/files/lekavarelijezofoja.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+theory+of+justice+by+john+rawls
    • 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_off0001ad56.bin
2b8fbde56a1496b0f2384089f329fc15f3a075df9f821728caca466966cf0da5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD56 21904 bytes
font_01_sfnt_off0001e5b6.bin
5cacf383878e2490ae1a85775b35b73a5f8512190358f893074461f72167f910		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E5B6 10968 bytes
font_02_sfnt_off0001ff32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF32 16792 bytes

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