Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b1b70b30d759533…

MALICIOUS

PDF

78.9 KB Created: 2021-09-17 23:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a4072e9c1247326f0145f7d9c7ba3f85 SHA-1: 2944031fea3f8d0c1902eeb3577b651df1e43f6b SHA-256: 7b1b70b30d7595336d1f347ca93d52b42b02cf49c91014f146dc6a48fc4e6873
114 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one that appears to be a redirector for a game download lure. The ML classifier strongly indicates maliciousness, and the presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick users into downloading an encrypted payload. The embedded JavaScript likely facilitates the download or execution of this payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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 https://pistant.ru/uplcv?utm_term=gta+sa+mali+apk PDF link annotation
    • http://gzmzwl.com/Uploadfiles/files/28510337912.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/rogipuriz.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/92989728106.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/mapufobokevasuzut.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/49174014748.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/24492916202.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161418f2adf290---57807526218.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/xivorikixojarepeg.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/fefowufirimavulejem.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/46441744744.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/39158481576.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0b38c188c---rewosupuluru.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/temojinajekaxopadesatenuf.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/13995480595.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/40616836229.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/xiwumoxaxetejuvoxoto.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/86377180717.pdfIn PDF document text
    • http://usagimatur.com/files/others/66916913744.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/wetuduzumemipokupuvivub.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/fozoganunojaxonike.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/tegexirej.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/kusavapekudorapenafejimik.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/87925777862.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_off0000d02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE845 10088 bytes
SHA-256: b8be420ae525e2eca70086fdf7f91126653c8318cc503b94092bd2440a5dc49c
font_02_sfnt_off0000febd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBD 18452 bytes
SHA-256: df8ab68e4e731d257ca5c23227865ee81eb0cbc9502fe39412cb7ebba22ea3e6

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