Malicious PDF — malware analysis report

Static analysis result for SHA-256 9119a8fcb59a3e7d…

MALICIOUS

PDF

70.5 KB Created: 2021-09-30 10:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 88b0b76204264cd5e889c4e24d2666b2 SHA-1: b2eeef18ac5dd59ec748cf7f80850e74fd19a053 SHA-256: 9119a8fcb59a3e7d699522b090a37fab8696c5bbc9c84601f2804fb114386c2b
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to suspicious PDF files hosted on various domains, suggesting a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs indicates an attempt to lead the user to potentially harmful content. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/3631d2bb012b3a4d3e298321faf44e88/letaliwevonewo.pdf In PDF document text
    • https://venusnvs.com/userfiles/file/tanokizolifowutokugup.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210922224340.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/zupinovud.pdfIn PDF document text
    • http://boldogelet.hu/media/66463339017.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/5829568443.pdfIn PDF document text
    • http://edituj.cz/res/file/82132571924.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/68403175915.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/furazalutodisogi.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/ximejo.pdfIn PDF document text
    • http://erpos.sk/data/files/84610657344.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/tiwenemew.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/padudam.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/51380561440.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/84228134975.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/35751606277.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/wirarifuzinenanol.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/lobidoviribirinela.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/befuvipagavavowabemoj.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/bafolagadorurerogasup.pdfIn PDF document text
    • https://phr4u.com/files/tupomuduk.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/zubizinumolupowa.pdfIn PDF document text
    • http://t-cso.com/upload/file_folder/file/48578745128.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/sobatetagubokaj.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/gogikewafopofupabekiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=mulan+live+action+full+movie+onlinePDF 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_off0000b098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB098 16572 bytes
SHA-256: b8e1dcb3e87b348996e0226797b62034c3b6cf616dffb631ccdf9b59094e91ef
font_01_sfnt_off0000db1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 10388 bytes
SHA-256: 551a42905944efed8886d2563a1290c7cfbb5621f76c304096587fa923c6c1a4