Malicious PDF — malware analysis report

Static analysis result for SHA-256 f467e1559e009eef…

MALICIOUS

PDF

110.5 KB Created: 2021-09-08 17:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d876fddc0488afefe9b43d62c7ad3a07 SHA-1: 37b66022c99127090ce84bcce5d96f0e0d621c39 SHA-256: f467e1559e009eef0ecd428d392072879f695acb472ea7a1496f069f41aa120c
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or a distribution mechanism for malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and numerous external links indicate a likely attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.dkmodels.net/ckfinder/userfiles/files/ruzunopid.pdf In PDF document text
    • http://1day2night.com/UserFiles/file/82606007687.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/38806319456.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/bigesusurajenobe.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/24082887991.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161386d0e2a8e5---79589568791.pdfIn PDF document text
    • http://topp.pl/_topp/file/96109454117.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/sezigemubisovisowux.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/37787321704.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/tatopufasunup.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/geduforifatenadulotese.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/12342070643.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/xopemifowefuwukuvavitefuf.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/17439261851.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/jaludanavafinunidinakudiz.pdfIn PDF document text
    • http://sb-78.ru/files/file/xirukemurabirik.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/notadofofuvopuri.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/tumomejeniwukaxasuwovu.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/96347656922.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138336539024---risuriwukavajexukoxo.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/ravuperumugu.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/43140792646.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/37797193434.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109040338071308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=supply+chain+management+short+notes+pdfPDF 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_off00014acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ACC 17968 bytes
SHA-256: d0a97f313ffb84e8b6b2043d613ed4ef19bdf937ed81fb2b3b037712da9b4457
font_01_sfnt_off000179c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000191dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191DC 11356 bytes
SHA-256: 01c060c0a3919902f151dba3d3c92014ec9bf34fd9ac1d88416010ecb05c9f54