Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaff64e8fd077f31…

MALICIOUS

PDF

85.8 KB Created: 2021-09-25 22:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4b8221e55ea499a7222d98a7951d9830 SHA-1: 7f636523143468d77f6eca84722d7f7f3f3d982e SHA-256: eaff64e8fd077f31f1c1b7d3ce81669149b1a63eae7ed6f3c560888dc588f12a
126 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malware. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, identifying the PDF as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://bortran.com/upload/image/file/20210924122553.pdf In PDF document text
    • https://edarky.net/data/file/35765234511.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/628536584.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/dupok.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/96675797283.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/0cu07rd2a55k03rg6d2ob0c0qp/63100577443.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/88059628394.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/32096838843.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/13908443439.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/8403097292.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/vixedofofipuzanifod.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/winaze.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5020381b4---52238725293.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/89873776271.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/dakilowa.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109250246485964.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/14846747971.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/58283050172.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/jisosurajopipazib.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/54699437632.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/2301729824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=aplicatii+pt+telefon+androidPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/rogafulibolufuk.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_off0000ec11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC11 10424 bytes
SHA-256: 334d9c3340a60ca4b316af59d5cc1e798f9e0ada90139580ea5803975fada555
font_01_sfnt_off000103cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CF 17492 bytes
SHA-256: f487cfe5535272d09df6aae98c46b6ef65c717a565a019cc39eb6deed4c64169
font_02_sfnt_off00013045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13045 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1