Malicious PDF — malware analysis report

Static analysis result for SHA-256 3212eb5c395da726…

MALICIOUS

PDF

58.0 KB Created: 2020-11-06 13:06:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: eb6d779c042c881ff43b96ac7301bfc6 SHA-1: 90999f644cd3e740489367c85ca0387a1bb95f9d SHA-256: 3212eb5c395da72641382c46d144760a109e3eaeec20b1e875c2b10e31ca676c
84 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier strongly flagged this PDF as malicious. The presence of an embedded URL and a heuristic indicating a 'download button' lure suggest the document is designed to trick the user into downloading a secondary payload. The document body contains the URL 'https://trafffe.ru/123?keyword=monte+carlo+simulation+in+excel+2016', which is likely the malicious download link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffe.ru/123?keyword=monte+carlo+simulation+in+excel+2016 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388428/normal_5f935019e41d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f8765fed6bb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369329/normal_5f914bd82f44d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367903/normal_5f875859b2c22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420745/normal_5f98e99ebea79.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/21344330145.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/volume_and_surface_area_of_spheres_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/20863470562.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/poetic_devices_worksheet_5.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/65087733564.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/dibujos_de_flores_rojas.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/novel_the_hunger_games_bahasa_indonesia.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://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9883 5496 bytes
SHA-256: cc937999cdcf189ea4f0ccc43c2a21404c6a0488bafe56e549f85521074964d8
font_01_sfnt_off0000ab27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB27 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000b3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B4 11372 bytes
SHA-256: 2ff45fc42117416a7941001dea2da4dead3d11f191e871c0665db2d16fb4d8e3

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