Malicious PDF — malware analysis report

Static analysis result for SHA-256 07ba3f15fbd47de4…

MALICIOUS

PDF

68.0 KB Created: 2021-09-26 12:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 879548d58958c8c98a1c93e63a727b88 SHA-1: 6df3d1adbaedde696a3e8f0062618bca263c4211 SHA-256: 07ba3f15fbd47de462ee748a1f4343cc140a46e3b5eefc0e3fc8b66a187e4a71
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier strongly indicated maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the suspicious nature of the linked content. While no scripts were explicitly extracted, the presence of embedded URLs suggests an attempt to redirect the user to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 4

  • 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.
  • 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://cructi.ru/uplcv?utm_term=adb+command+line+tools PDF link annotation
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16141643be921e---jikobavepu.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/fomanejirede.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/44887762819.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/9600634541.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/77405228359.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/59193172091.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/xixemaf.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/xivukov.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/wukojuvojumo.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/26776169800.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/detomekefavebuxezanexiket.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/vigujubomiwaseloj.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210912_54A48D7E3BCD25E4.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/71010050545.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/94131590027.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/logazuxupabive.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/dedavosubujapimo.pdfIn PDF document text
    • https://stotex.rs/files/mobapelopadatepipamo.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/38214042897.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/64103103978.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/tebevigon.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///26557032238.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/wezowunevasasasefo.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_off0000ad36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54D 10552 bytes
SHA-256: 999c9cdfc1b97866b7b41b783f525f389dc52f8872a6207de0100d01a6ae7da7
font_02_sfnt_off0000dd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD53 14916 bytes
SHA-256: c6291490182e6e4e331dffabfe4c51b275e57a772cf507d1dadf7456bd7863c0

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