Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc443f6b5dd5314…

MALICIOUS

PDF

74.4 KB Created: 2021-09-24 13:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb7e9b895a906c6d3a4245d6b0154029 SHA-1: 48d60a95654a7e3141474ac9e7683ae28cbedcb6 SHA-256: cfc443f6b5dd531487eb6e566557c110683c5bab6d6c544c2b2f2e838a33ed8d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to redirect users to various external sites, likely for malicious purposes such as phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nomylo.ru/uplcv?utm_term=debug+screen+android PDF link annotation
    • http://erulingua.hu/uploads/content_files/files/sajus.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/zapuraxupam.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/jogamorope.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/25755871982.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/65964853385.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/giwumize.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161448d46bed46---fekezinepitolebupekobuto.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/38096062575.pdfIn PDF document text
    • http://strandedtattoo.info/file/78975880038.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/11972220737.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/18259541811.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/dedezosepon.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/77589273753.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/78282193169.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/83130298542.pdfIn PDF document text
    • http://ailizia.com/userfiles/rakukokegudil.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/24596905494.pdfIn PDF document text
    • https://dental-essence.com/admin/userfiles/file/72510205610.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/rezavugalixulanafox.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/36937695613.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/35509773554.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/34771631925.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/41680270492.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_off0000b89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB89F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B6 10640 bytes
SHA-256: f4be387170b4d0590c03d91387a85ba081ad0a79c0c907ae7f012bf797cfc69b
font_02_sfnt_off0000e8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EF 19676 bytes
SHA-256: 5f9b2e72d2dde207f144506bf5ca113a42bd015157c15145f575b49d617b0cfd

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