Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd84322bddf8f52…

MALICIOUS

PDF

79.2 KB Created: 2021-09-22 09:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 93b05f43de8fe1dd1d25881f2f10dbf8 SHA-1: 7898974f1731257bd04ef08ff3171eb548205ccf SHA-256: bdd84322bddf8f52d55cc36da24575cdc9b7727cbaa51d3d1add2244c17940dc
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by multiple heuristics as malicious, including a critical alert for requesting recovery secrets. The document's structure and numerous external links suggest it functions as a link farm, likely intended to direct users to phishing sites or download further malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://kokocurry.gm/userfiles/file/purifi.pdf In PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/xijotud.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/39857031023.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210907_031949.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d98b6e3afc---dogatuwigesarujosevi.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/xunatusew.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/24241406642.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148c3e8d757a---31355358105.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/wibidajogumu.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/97514761311.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/61447714b88bb.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/81714646529.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/86485736184.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/77170673757.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/21551582918.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/35376167562.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/sudejewoxixitefonitid.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/48914890245.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/62658726769.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/55995437047.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/zarujemikuloletumemokop.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/73504574753.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/10133284061.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/68358199132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=android+find+friendsPDF 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_off0000d3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB5 17836 bytes
SHA-256: 6bd4df27968d302d22c13662e5b0a286062f601ede202125e40978aff051794a
font_02_sfnt_off00011912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11912 10020 bytes
SHA-256: e4531217cef2cac1ef04136f9546256e3e1d2050dde43c41d06343b4e110797e