Malicious PDF — malware analysis report

Static analysis result for SHA-256 3191d6491011939e…

MALICIOUS

PDF

88.0 KB Created: 2021-10-05 11:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 00f539038ac42acb16c09205f342909e SHA-1: 82380866461f5301e68c9d3c93a0531d065d5c7d SHA-256: 3191d6491011939e5048996b3d351fd3f5cc1829770f8d64781460eb7febbf41
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers as malicious. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, often associated with phishing or malware distribution. While no scripts were explicitly extracted, the presence of external URIs and the link farm heuristic strongly suggest the PDF's purpose is to redirect the user to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=the+emperor%27s+new+mind+pdf PDF link annotation
    • https://hankilfood.com/upfile/files/86666248783.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/65280081374.pdfIn PDF document text
    • http://medrea.ru/upload/files/sawitedararimu.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e2bcd71fc---waboxugofas.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e317430922---88539728780.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/87159819391.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/74549513852.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/80972577453.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/fatiresu.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/88441198182.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/zidatubusepezisufog.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/masodotodimudepilufukej.pdfIn PDF document text
    • http://osayit.com/images/file/mikuwuzovuja.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/31944855797.pdfIn PDF document text
    • http://prograsifkalip.com/files/11124862433.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/lefofalelakisiforiditari.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/mivunixekuramisosadorawu.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/bovafam.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/98441074059.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/zigoxulirulepijaxib.pdfIn PDF document text
    • https://fasleh.net/Files/files/kubodim.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/67441009510.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/lidegelapoki.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109100845594555.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/xosadorekupifuravajuromo.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_off0000edf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF0 10540 bytes
SHA-256: 001acfb22591a0422edbfd47525bd04a87451d9d83b5f75c7a385845b66e831b
font_01_sfnt_off000105c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C7 19856 bytes
SHA-256: 9e8c19b7cc50c36ef586c5889ace6b5a0c815e456fc1d576156a174bcf2d4ccb
font_02_sfnt_off000139fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1