Malicious PDF — malware analysis report

Static analysis result for SHA-256 12467845006ae5ac…

MALICIOUS

PDF

84.5 KB Created: 2021-09-09 20:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b581db72488c0c6f07e27e80870a4599 SHA-1: 02079536848f3d45bf3ba1934e084351292e4088 SHA-256: 12467845006ae5ac1e1195fc468aa5ec78daa5eb5304f03d06c8487851f08243
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and external URIs, indicating a malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' strongly suggests the document's purpose is to trick the user into downloading a password-protected archive, likely to bypass security scanning. The embedded JavaScript and the presence of multiple links to PDF files further support this phishing and malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/73053316228.pdf In PDF document text
    • http://okfilm.kr/userData/board/file/8859421542.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/tikojokezad.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210901075338.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/43aec36ee117512e43775c21ee3743e9/99736403695.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/23422287492.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/4049998572.pdfIn PDF document text
    • http://npas.ru/pic/file/11077338927.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/xukew.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/zefobaxafevevu.pdfIn PDF document text
    • http://kmsenior.org/file/files/52009812540.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/lawitekeravokuxonetef.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/70562323054.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210903034547.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/73826811450.pdfIn PDF document text
    • http://medi-sen.com/files/files/28636681503.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/bavivogabatuw.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/30141725766.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/lofofuzogodivuzuzetu.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/gonuretofixisofatoz.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/vovuzivexekiposovibu.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613439d7e76f7---fofojeweduxedif.pdfIn PDF document text
    • https://matratva.in/userfiles/file/31666156754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=download+rar+android+apkPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/kovalibenaguxikubiduto.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD097 17224 bytes
SHA-256: a2133bfe34a0f8ee329237aa1c9f16b2a72107a76fc37bc7b5b25639755caae1
font_01_sfnt_off0000fd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11588 10164 bytes
SHA-256: 2612e5bcb7b51e05a508d51b1dafee6e7aefe0c57905832714ed91e477530a88
font_03_sfnt_off00012c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C50 16600 bytes
SHA-256: db20457482742052b8c48bf65b5110f53555b1485a6d4fa41db7f8f981afbbbf