Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d7cab10f5b96d2…

MALICIOUS

PDF

74.1 KB Created: 2021-09-19 01:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f140b074ce97a3335979a34db369e8ce SHA-1: 8ee912c98afa5645fc835b63af6da38b6938930e SHA-256: d5d7cab10f5b96d2556a324c78dac46459ea4e01ed3ef17df325f9eb86e41f89
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including external URIs and a URI pointing to a raw IP address. The ML classifier and ClamAV detection strongly suggest this is a phishing or malicious PDF. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the IP address in a URI indicate an attempt to redirect the user to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://medvor.ru/uplcv?utm_term=kotlin+gps+example PDF link annotation
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382b6fe1500---wabusij.pdfPDF link annotation
    • http://delve-cr.com/uploads/74297332828.pdfIn PDF document text
    • http://leton.pl/userfiles/file/88938284891.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/18815169911.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/bomeduroneb.pdfIn PDF document text
    • http://tiquital.com/documentos/file/33984413096.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/gapemuj.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/fozipuve.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/5402407354.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/nikarufimefuligudeg.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/dovaxedezisa.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/86772858649.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/jepamorezuxaju.pdfIn PDF document text
    • https://areicon.com/images/file/vadigape.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/zagefun.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/bojotili.pdfIn PDF document text
    • http://elpijisystem.com/file/dikitutikezer.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9ac09e6b8---dumalejoxokujavag.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/98541616063.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/89136228833.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/muwuzejepevamukogatuxog.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/22633521732.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377dd0ac653---4323748183.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/36991038662.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_off0000bb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB85 10588 bytes
SHA-256: be88bf3a695e678ea2ed7b23feb08c0633d12fa4a45bd4a6b45c6e3627fff032
font_01_sfnt_off0000d3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD2 18292 bytes
SHA-256: 6e17f63f5007e945babccb4aa39021b513b5870515412831e229c309db3ef7aa