Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e9622aecf4bc91f…

MALICIOUS

PDF

94.2 KB Created: 2021-07-16 23:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ef3cc9167246dff9da4076848a0f6346 SHA-1: 2ae8b5b530fa969079d7a201eac09811b47f986f SHA-256: 2e9622aecf4bc91fbe10c53af0996a3030d88a7d878e6b674cf4aba8ac7bb847
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains embedded URLs, one of which is identified as a redirector for phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the presence of a redirector URL suggests an attempt to lure the user to a malicious site, likely for credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5781

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/XMoLd4EPXkg/square?utm_term=carbonic+anhydrase+formula PDF link annotation
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60eda6f503cb9e0b5979e550/1626187509915/how_is_artificial_selection_different_from_natural_selection.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8ebc7b9b95949b65c1bda/1625877447661/croatia_places_to_visit.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec70ffc3fb560d26f0e4d0/1626108159724/mobuf.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec98cf4f2b1c51afa5a771/1626118351285/surf_and_ride.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_off000108c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000120db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DB 18880 bytes
SHA-256: 2e9c877004dad5c06e3c67edb763aea9ad3c6d9c34dc6311d15aba7d66f67f09
font_02_sfnt_off000153be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153BE 11028 bytes
SHA-256: 1e5b148f5ecaf3fdd280ae0caf6070565dd52775c14286d42f7a51a3bee3308b

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