Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4d33bd2936ea2f…

MALICIOUS

PDF

86.7 KB Created: 2021-09-22 15:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ea091eb70dee2e7084ceaf3c2a84876 SHA-1: 9bc50c8b3f30c65da6ba7687cca894df4552d5d6 SHA-256: bb4d33bd2936ea2f5286bb764b081cbf5bfbbecbf493f759c856de39afa1983c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://areopag-group.ru/sites/default/files/uploads/53531347564.pdf In PDF document text
    • https://kokomanis.com/contents/files/vutujajaku.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/xamevofiwo.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/fb8d3cfaf541b6d5004fcc3ff945ad53/61110653124.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161409b02a9ef6---85810146200.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/fewadelibiwibepo.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/sibuzo.pdfIn PDF document text
    • http://jawarakreasi.com/file/64258397893.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/40605678225.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/resubafikulakunelelam.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/25332204.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/68159760107.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/zadadexomapip.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/domumaxeruvibagaru.pdfIn PDF document text
    • http://kechengchem.com/upload/files/xutejetoko.pdfIn PDF document text
    • http://hueide.com/upload/files/91803127195.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/12522401115.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/13756290374.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/49351135004.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/74657038630.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/26014464860.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/58878663631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=windows+7+pro+iso+filePDF 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_off0000f022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF022 10360 bytes
SHA-256: ad99ec3d633aa80968bcb8eaf4b36f05f56562a821433a7a45d2f8d6ca4bd2dc
font_01_sfnt_off000107ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AE 17840 bytes
SHA-256: bb4e8b92545dc68e68d0624ccc0617e4d15bb2e24aef02e6cb0ecd78b8c70f8c
font_02_sfnt_off000135ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.