Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d18f91e4c13e42f…

MALICIOUS

PDF

252.9 KB Created: 2023-03-22 14:27:31 +02:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 5.15.4) First seen: 2023-12-11
MD5: 156025f9c9b97c9a41befba827dd5d5b SHA-1: 9682f6005ef040552445169eae1ef96c6f8a4a88 SHA-256: 5d18f91e4c13e42f820eebad1c04b960f7df748ab7683c583890ef1d83a26774
126 Risk Score

Machine Learning

  • Nyx PDF Classifier clean score 0.0318

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
  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://vajewesubalax.fecuq.co.za/wb3?utm_term=mil%20std%20202%20pdf PDF link annotation
    • http://www.bitstream.comIn extracted file (font_00_sfnt_off00038c57.bin)
    • 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 extracted file (font_02_sfnt_off0003d4f6.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_02_sfnt_off0003d4f6.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00038c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x38C57 19208 bytes
SHA-256: 94702c137d213ccad30e42250e3ca48a18459ca535da7ae337c7534a4707dd90
font_01_sfnt_off0003bf4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BF4F 9204 bytes
SHA-256: 7910f8880341369f1f180abbe2fe8068801153897d51ea31ea87e30dff0d6b58
font_02_sfnt_off0003d4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3D4F6 8940 bytes
SHA-256: 897a1d9f6f4b474150d2504b8fa79d1507a5ac285a7fb2bf61803f06dc51c46c