Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78354e5f94ce196…

MALICIOUS

PDF

81.3 KB Created: 2021-09-10 10:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9c43a51a8523c3fdaaa2eb0175458ebd SHA-1: 07fdb823cc99b8c22df99f8ac896b28d649208b3 SHA-256: d78354e5f94ce1965c37e4a5173b17f90c8e15590a75a5ae8d74ad3a21e8ab31
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content or facilitate further exploitation. The primary attack pattern involves luring users to a network of potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://metallpress.info/files/55333739974.pdf In PDF document text
    • https://dongcohonda.com/userfiles/file/44949014638.pdfIn PDF document text
    • http://cosyromania.com/media/file/bizaloxo.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/gepure.pdfIn PDF document text
    • https://geniodelweb.com/file/domijaguzi.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/592117539.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/kokusubo.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/kuledofezinadawogurinur.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/43404267343.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/kinejivo.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/tanuzibutegewipelef.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/zusoxelug.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/duzazogonaputofab.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/65288300664.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/fodifivotofetesik.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/baseduxabegoxenufisadem.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/83288652677.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/bozonejodafigeserewa.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/94592303665.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/rurododa.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/42929791707.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/c3fceb268b4a0457dafa058491835a73/bevufifoxomalo.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/94103846614.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371ca1e2551---bagul.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/dofowekitumikozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=corner+mullion+revitPDF 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_off0000da39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA39 10136 bytes
SHA-256: bf0dd2795dd08acf9106b0be9e92e1e28652074fa26da2337c4b3c93c7403264
font_01_sfnt_off0000f0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EE 18000 bytes
SHA-256: 8470040c367106a2c8b7a76395a055bb7b7e05fadab38e3e5e2460dad1854616