Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d5af877306fe9a…

MALICIOUS

PDF

82.8 KB Created: 2021-09-09 03:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a75a6c82aca22af5abe468c61ce4ecf4 SHA-1: 9d85caf20aad489d9d4a39e6a9fc6b6e2503dccd SHA-256: 33d5af877306fe9ae51ee4c39cd9fc12a72a548167e0dc0040fd403efc7a4a66
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or malware distribution. The presence of these links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6c11b5d05---rogevasesamerereviso.pdf In PDF document text
    • http://hcvitamin.com/webroot/img/files/wawivizime.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pikagoxasogax.pdfIn PDF document text
    • http://isvpro.com/custom/files/77232194997.pdfIn PDF document text
    • https://aromamarketing.md/img/files/12942260207.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/gakikilovujef.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/89503247531.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/36140826793.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/libaxodosedoremituwulo.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/kotida.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f4b41c252---lewoxevoxerejovaduzulali.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/pifimuso.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/talele.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/38255250696.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/negutafimolo.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/vepabimipubiwoximav.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/totuxuxon.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77152572984.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/kadivaviwoke.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/wexujanunanipaguru.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/mufalazerowazevin.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27228860420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=i+beg+u+meaningPDF 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_off0000da9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9A 10108 bytes
SHA-256: a565e9812c8871906243ecc3d4c8252700c123bd4a89c0292a30d99aaa1decb8
font_01_sfnt_off0000f114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10926 20112 bytes
SHA-256: 0d3164fcb1705b38f7af718d4e2ba74018cef41590d2a7ad77a11f3bf98e0fbc

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