Malicious PDF — malware analysis report

Static analysis result for SHA-256 48dc47d8228bdd39…

MALICIOUS

PDF

83.4 KB Created: 2021-09-11 20:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7837a3d92573dfd484d4a371efeace36 SHA-1: f532a308c7cba26407c52131e38ca6fcaa1979a8 SHA-256: 48dc47d8228bdd39aabc262ce324c1a339cc2b7c0414270f9dd9ad02a955743c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URLs, including one pointing to 'garglob.ru', suggests the PDF is designed to execute malicious code or redirect users to phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the phishing or spamming nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://garglob.ru/uplcv?utm_term=train+to+busan+2+watch+online+free PDF link annotation
    • http://jr-bang.com/uploadfiles/20210910224443.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/53046646375.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/lejokipilif.pdfIn PDF document text
    • https://uudanbury.life/files/file/68235036800.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/7740580948.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fojegaziroderusu.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/72784815687.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/wofaguvikatuvisis.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/19670308792.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/40848328547.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109041900147292.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/51934113524.pdfIn PDF document text
    • http://ducnhua.com/upload/files/92202551168.pdfIn PDF document text
    • http://qwerty.pl/_data/file/54961797860.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/4662300515.pdfIn PDF document text
    • https://halkum.rs/files/83117338645.pdfIn PDF document text
    • http://landia-print.com/pdir/file/ruvasixiritesuvenirugodur.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/fivedodajosilamosoji.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/ravewutinaperewirino.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/volesefu.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/18039494061.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/31164582187.pdfIn PDF document text
    • https://diphong.com/uploads/62554955413.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/nunenisuxudugufufufite.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/mufafugilobojapipozav.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210902173112.pdfIn PDF document text
    • https://titishop.co/upload/files/97866810722.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_off0000df35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 10840 bytes
SHA-256: cb6df708b7e66072c989023f8c80dc4989db252b84c4542233850ed6572bfc06
font_01_sfnt_off0000f84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11061 18468 bytes
SHA-256: 3577c1f849c01d768fe98db4a73676da3297c6817ed1e30ec2e914c9f1deefe3