Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb83460f78a67fe…

MALICIOUS

PDF

69.3 KB Created: 2021-09-16 08:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1e1e4a89645d744ef154751ba5e66418 SHA-1: 48205d75216ccc59b8e196ed2a6e5f17fedf1aa8 SHA-256: afb83460f78a67fe03d2ef1096e84293d9717f650727b7d2ad30137b12690200
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external URIs, many of which are hosted on disposable domains, suggests a link farm or redirection mechanism designed to lead users to malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/verisu.pdf In PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69507144658.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/benoxakag.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210913171635_cgatyi.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/20860949935.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210902211650.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/19450894939.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/vizamiwafewuke.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/8874538922.pdfIn PDF document text
    • https://novitas.ro/files/70575443278.pdfIn PDF document text
    • https://funbugs.ie/files/file/nosonulojomoxiri.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/32798745739.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/tirezije.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1025023e1---nuduzuvirivasonipe.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/niboruzup.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161413b725c9b5---jezepekegom.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/58003910947.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/xibafotefarijusogeno.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/melomometiru.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/maliforojadurisadud.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/31183001453.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=best+single+player+strategy+games+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_off0000b07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC891 10900 bytes
SHA-256: 83dd3709a6630c94fb9345b03e12ff0c2fd2faf869be989e552109d7effbb6a5
font_02_sfnt_off0000e19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19C 15128 bytes
SHA-256: da5102d7421682f5e48e46deac741a5908900e2210de76c837f65376b0660a5f

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