Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e0fa1d530cfc40…

MALICIOUS

PDF

68.3 KB Created: 2021-07-13 06:40:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1c75ea1fde2b9cc6ca1fbe27d9bfd0af SHA-1: b5dbcd3d5a4b1990813480833dbadd0a66533673 SHA-256: d8e0fa1d530cfc405d36186706267c203032d258eab5e9e2eead3ae05ad2895f
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a heuristic firing for a redirector link, indicating a phishing lure. The ClamAV detection and ML classifier also flag it as malicious. The embedded URL points to a Google feedproxy, which is often used to obscure the final destination of phishing links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6064

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://feedproxy.google.com/~r/razvivatel/yapz/~3/IdU8rIDf9lQ/square?utm_term=deontay+wilder+and+tyson+fury PDF link annotation
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ecdfb1c1f2f619459c4e63/1626136497271/catalyst_used_in_deacon_process.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8fc03566ded7d61ab5b26/1625881603701/lexuwuvaponotuwapa.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e94e076e267257943c3320/1625902599683/4255691247.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec93535f8bf969071f2e10/1626116947479/14574200439.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_off0000addf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADDF 10648 bytes
SHA-256: 9a8deffdcd668291ae21383819645dc35529a37aff19ba4a81d3897a95b84f34
font_01_sfnt_off0000c675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC675 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE87 15092 bytes
SHA-256: 0bb0daa6dee3f7ff68660b734ac86861b355550a39bafc4cfa0e6dcfbf1c761a