Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5876cc3dec8d45…

MALICIOUS

PDF

76.5 KB Created: 2021-07-15 13:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 400a5a1ba0f5aa851ebaadf5b5976c92 SHA-1: 9f6278ab9711563b13972fc2c0dabd5d25c84480 SHA-256: 0a5876cc3dec8d45c49d3ab52285e42c512ccbe1bb42c2683b77f3ba56b90332
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it contains an image lure linking to an SEO redirector, which ultimately points to a URL associated with phishing. While no scripts were extracted, the PDF structure and the presence of external links suggest an attempt to lure the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7939

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/sq/ugae/~3/UZrB20b2Dcg/square?utm_term=stupid+questions+with+no+answers PDF link annotation
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec8902f89f8e700bf80294/1626114306095/income_and_expenditure_account_excel_template.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e85e6189d2062abbfa8435/1625841249344/niall_horan_in_one_direction.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60effddbb37dc55b034fffe8/1626340827460/love_looks_pretty_on_you.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_off0000ca4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4E 10848 bytes
SHA-256: 0d80689cd4c56b393f105f487757dc71171a5e5f27436758a25aa04baffdcc46
font_01_sfnt_off0000e317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE317 16144 bytes
SHA-256: 1daa9372a036e0e1f0c8c9340683741718d648819f174189162a46cb4b389301
font_02_sfnt_off00010c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1