Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b8e3e92ef520df…

MALICIOUS

PDF

86.7 KB Created: 2021-09-12 00:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 627bcc8b5b0b950dde875a0c88a4a023 SHA-1: f28298dbfac03e68040122dcf93c0a1ed8ee70c6 SHA-256: 22b8e3e92ef520df96ca1b486ddf76896411230b82efde39c863009cd572babc
190 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect the user. Heuristics indicate a fake invoice lure and an MFA/one-time-code harvesting lure, suggesting credential phishing or further payload delivery. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://chcial.ru/uplcv?utm_term=organize+text+messages+android PDF link annotation
    • http://www.gc-antey.ru/ckfinder/userfiles/files/35228424975.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d0a58abc9---dewemewitizasovije.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/lisinomo.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/xuxonajexinido.pdfIn PDF document text
    • http://gdgom.com/upload/file/210911173517819473ko1g2o0u1o43.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/fewalaxu.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/muzugewabamezoselepu.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/renudunuvodubi.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/zitabowamepufer.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/jametuneju.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/luxevopararupa.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/nirujatagovufizobiwegor.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/37418007758.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/55883007100.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/26025458936.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/16010944770.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/biwigufeluwoxoxusemowak.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/13962953609.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/1138893060e86c5a5e37f57528db35d5/fakakuwirikudaw.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/gokumujinukid.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/64535371164.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210902194310.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/35854773191.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/gafokuxite.pdfIn PDF document text
    • 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_off0000ec1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1A 18696 bytes
SHA-256: 39591260ae739c9fbf814bf457797f09efb863ee165a3f90986007cfe0cf74ff
font_01_sfnt_off00011c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C47 10732 bytes
SHA-256: c7c2080c13becd912e5fb629173cbba5b49b951552058d657decb4be12444f9c
font_02_sfnt_off000134d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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