Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78b46b51183670f…

MALICIOUS

PDF

73.3 KB Created: 2021-09-25 12:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 29398ab003b7ab57ac9834cc11618d79 SHA-1: 2d0936b5b1a346cb7842eef9b3608502b406df40 SHA-256: b78b46b51183670f3fa69143b3491b2fec79ff8f7944e2eb7c0edf4e7c7f6b29
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains numerous external URIs. The PDF structure and embedded links suggest it is part of a phishing campaign or a lure to download further malicious content. The presence of multiple disposable hosting links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=d%26d+5e+dungeon+master%27s+handbook+pdf PDF link annotation
    • https://shevian.com/images/file/memogukotomaxomanujale.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/38115456313.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/64858523598.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/84199759873.pdfIn PDF document text
    • http://lecostationery.com/files/file/fapumutibiverinewumuki.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/56817033064.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/munadamekomide.pdfIn PDF document text
    • http://formacio.fic.cat/uploads/file/karizuli.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/32541311708.pdfIn PDF document text
    • http://robbes.nl/media/files/25800814539.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/wevesajotejinopowekefoji.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/zawelizebezefujolupisam.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/70486733163.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/sujokebotuwit.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-14/20210914081548225308.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/wegenumefuzesogexebolose.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/porimadenimikusipe.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/vazulomobalipufufirize.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/zovewizatudipu.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/woxarimutepiwovu.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/zudisiliz.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/52974807980.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/34678626140.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614afce778768---ribuwuwafokobagesusonijar.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_off0000bcbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D1 18624 bytes
SHA-256: 08e28f3d9eb80f1df083dcf2210e59f39f9ca8bc19c49dc568f97e1a619b5909
font_02_sfnt_off000104f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F6 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8