Malicious PDF — malware analysis report

Static analysis result for SHA-256 c09c179a353f1490…

MALICIOUS

PDF

68.9 KB Created: 2021-09-28 07:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 394feafd3d4b51ca703567c57cf19fcb SHA-1: f7b9e32b7d0dd7247e1bd5391e851870650e0fc1 SHA-256: c09c179a353f149087f0e7813fe0330522bca7ac36ec9f315986f8e6be394f9f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9891

Heuristics 5

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=gallen+vs+hunt+free+live+stream PDF link annotation
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11434985852.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210908_4C6DD930E12DBA66.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/2585299837.pdfIn PDF document text
    • https://telorgabus.com/contents/files/posalanopebidapej.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/mizipafufuxudarogofogid.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/77644764754.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/26589723908.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/70537538909.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/38977187229.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/videla.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/69968220117.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/2263335081.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/93710683652.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/83034369057.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16148bba397792---jenadifoxifopafagebew.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/41410948778.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/76833529660.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/dixamuzivixisu.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/94875205431.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/feduxowesimilom.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/45744410166.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/gixinazijumudezelari.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/90759059431.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/37851958774.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bopitirigi.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/gosekelesuwepe.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_off0000b031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB031 14908 bytes
SHA-256: 8770b04ed94a8efea6c72bba588bab090e6ac1c71d942d3b8c44f8ddca4dc9dc
font_01_sfnt_off0000d5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D7 10564 bytes
SHA-256: 58438f15a1c0cc2ad80e42feadc0a6f0425be98d7aec18d008039732e513c7de
font_02_sfnt_off0000edc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1