Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab14af9773e5bc5b…

MALICIOUS

PDF

58.2 KB Created: 2021-09-25 15:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 942862e47ce10f42b6c99f18bc67f45b SHA-1: e4f9fcf971819f2fd605914f6dcf6c23af091c24 SHA-256: ab14af9773e5bc5bf47690f683571aa5ceb1464090e14e592d750765ab38cd9c
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malicious content. The presence of JavaScript suggests an attempt to exploit browser vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6644

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.
  • 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
  • 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 https://rzfmuhasebe.com/userfiles/file/71889714660.pdf In PDF document text
    • http://freeware-software-download.de/uploads/editor/file/lulofexipapasiwota.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/waborigogogegijafese.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/46154757964.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/26650689267.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/39976718275.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/kixufezuwased.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/97397238685.pdfIn PDF document text
    • https://invision.buzyhub.com/files/xowuzudiralozejaz.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/79829950620.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/pifetesoj.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/35535374988.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/nolizifupoped.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/panotaxunozifabozifomij.pdfIn PDF document text
    • http://bankerz.in/qpic/files/mekaguxebusa.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210905093032932211unwri2.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/78468476272.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/68501497515.pdfIn PDF document text
    • https://agros.net/uploads/file/mevumoteziku.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/8052124930.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/varusorasipirevup.pdfIn PDF document text
    • http://ned.ru/uploads/files/laxat.pdfIn PDF document text
    • http://hzdsbg.cn/uploadfile/1630768586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=chronicle+of+a+death+foretold+pdf+freePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99E 10580 bytes
SHA-256: 848531d35528e7901368c8d9df90a0a87e78511e4dc68320fb596562a1f5a30b

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