Malicious PDF — malware analysis report

Static analysis result for SHA-256 038c4021a38f477e…

MALICIOUS

PDF

365.7 KB Created: 2015-11-07 02:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.2.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 98aa7961a51e6df61ae46cb0d0ee8072 SHA-1: f0e17e3a885dbfe6f26efa5cd21be0b24aeb2132 SHA-256: 038c4021a38f477e1c99feb9255d7b398ef0a5919c6e3a6a40dcf4115385c337
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high-confidence heuristic indicates an image lure linking to an SEO redirector. This suggests the document is designed to trick the user into visiting a malicious website, likely for phishing or to download further malicious content. The primary IOC is the redirector URL found in the heuristics and URL extraction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 4

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://taurus-tg.ru/?nnr&keyword=%D0%9C%D0%B0%D0%BB%D0%BE%D0%BB%D0%B5%D1%82%D0%BA%D0%B8+%D1%80%D0%B0%D0%B7%D0%B4%D0%B5%D0%B2%D0%B0%D1%8E%D1%82%D1%81%D1%8F+%D0%BD%D0%B0+%D0%B2%D0%B5%D0%B1%D0%BA%D1%83&charset=utf-8 PDF link annotation
    • http://media.nn.ru/data/ufiles/2015-11/db/3f/6e/563cf9170d4a2_obrazetsprikazonaznacheniivoditelia-nastavnika.pdfIn PDF document text
    • http://media.nn.ru/data/ufiles/2015-11/12/6b/11/563d25eb386ba_skachatigruthesims4nakompiuterchereztorrent.pdfIn PDF document text
    • http://media.nn.ru/data/ufiles/2015-11/34/94/6f/563cbb6f26a08_parizhskaiaivashingtonskaiakonferentsiiasravnenietablitsa.pdfIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00056e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56E0F 8060 bytes
SHA-256: d3c086a28850e37cb867171a0938dd387805c23136e1688c2a7f8c30a2facde4
font_01_sfnt_off00058550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58550 16172 bytes
SHA-256: 8e6ae49ed694f211a7db0cfe3c815d7c16c48b02572b735788a6bf5ce4914a3b

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