Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef51e72372df9014…

MALICIOUS

PDF

78.3 KB Created: 2021-09-19 19:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 00a147c5c33b1e527f9432a4e0cd9012 SHA-1: 1518006f272bc0a5d4adc5b8afe8e85b3b2cd32c SHA-256: ef51e72372df9014af362a6fe830297fbab090a043df173ebc592f440e7f54a3
134 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm. The PDF contains numerous external URIs, many hosted on disposable domains, suggesting a phishing or malware distribution attempt. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://selfmadefilms.nl/userfiles/files/28181200579.pdf In PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133b60ca981a---juxizifarilinojip.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/jozomeraxuwisa.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/punobumekuropomox.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/rises.pdfIn PDF document text
    • http://candientushinko.com/images/file/30822321291.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/tijukebukelozotakozus.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/61981983846.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/49748412584.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/86279835144.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/42042309029.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/sikemiburepajuzeraxasil.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/91209268457.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/zegibovolubokugokij.pdfIn PDF document text
    • http://domplus.su/userfiles/files/lakujunurefef.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/nowixeji.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/6599822979.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/zutuse.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/zemosezuf.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/15242711973.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/562c34c074912487a1c606da34e19da8/53190302107.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/tixanigonawod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=square+root+of+1020PDF 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_off0000cda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B5 18192 bytes
SHA-256: cbb2cebb4b26646dec68a3d5fc60994445f0cf7284d1d93b91508142f4f16ade
font_02_sfnt_off0001147e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147E 10412 bytes
SHA-256: b16cc7d7ae8ab10eecae0856481486d98cc0abae08bc7cdb924d5ce32202ef38

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