Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3d3c19acf3cef4…

MALICIOUS

PDF

45.2 KB Created: 2020-04-09 12:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d73068ad1a35538e26b8dc7b44d4820c SHA-1: 78a39f3ba3ef224ef5837365fceed0cccc160511 SHA-256: ff3d3c19acf3cef4bdf47bc1091b621e3c8e1eab3d3537f508beb70936a8d215
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution network for malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is designed to redirect users to potentially harmful content. The document body, though partially corrupted, contains text related to health information, suggesting a lure to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 http://monroestudios.nl/uploads/1/3/1/4/131437865/131437865.html#example+of+reliable+and+unreliable+sources+of+health+information+and+products
    • http://paulmarr.com/uploads/1/3/0/8/130813798/d4afba73d0.pdf
    • http://square-centre.com/uploads/1/3/0/7/130776492/fusolewud.pdf
    • http://towsonpikappaalpha.com/uploads/1/3/1/4/131407952/029595.pdf
    • http://westpointinvestments.com/uploads/1/3/0/5/130588307/3590387.pdf
    • http://sunrayharvesters.com/uploads/1/3/0/6/130621983/659632ddc58.pdf
    • http://natalievdw.org/uploads/1/3/0/2/130270804/980782.pdf
    • http://inthesmallthings.com/uploads/1/3/0/5/130550826/ce00acdf898b74.pdf
    • http://mybrothersnuts.net/uploads/1/3/0/5/130588279/1024235.pdf
    • http://rocklandcountydoula.net/uploads/1/3/1/4/131453454/92fc7fc54f3c9.pdf
    • http://g2ggold.com/uploads/1/3/1/3/131379392/sagokutew_gatalo.pdf
    • http://www.whale
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000864f.bin
e8c42520cb96b1d99ffe477dfc61e5158d612f6326bc21544c303a5b62122baf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x864F 8572 bytes

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