Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5e31396e602c79…

MALICIOUS

PDF

38.4 KB Created: 2020-03-28 08:02:16 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cf2a6f6c1ed0b5f58c8c663be60dc9a8 SHA-1: 0802fb5809977421e8e8f9156ea3169dfce50c1f SHA-256: 1f5e31396e602c7948d6e508d4668aab68747a0da387c914cc1553c43141da12
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are numerically or generically named and hosted on unrelated domains, indicating a link farm designed to attract search engine traffic. The document body, though partially corrupted, contains text related to printer installation and includes a URL that mirrors the document's apparent theme, suggesting a lure to disguise malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for malicious redirection.

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://ameenahsan.in/uploads/1/3/0/4/130476272/130476272.html#how+to+install+epson+xp-400+printer+without+cd
    • http://dovechalet.com/uploads/1/3/0/5/130551859/9463974.pdf
    • http://rinksiderookie.com/uploads/1/3/0/7/130775883/sobopevil.pdf
    • http://transportlipigorski.pl/uploads/1/3/0/2/130270849/8d381a7fe3573b2.pdf
    • http://alchemystudiosalon.com/uploads/1/3/0/4/130476168/41530794f18c.pdf
    • http://marymichal.com/uploads/1/3/0/6/130621137/dekabawubokizejeva.pdf
    • http://king-alexander-minecraft-java.com/uploads/1/3/0/7/130776573/ed0854b36ff.pdf
    • http://www.southendcore.org/uploads/1/3/0/7/130739291/levegowo_fibevikomuje.pdf
    • http://simondavidhunter.com/uploads/1/3/0/4/130477448/6156056.pdf
    • http://ingridsolbrig.com/uploads/1/3/0/6/130604693/71422b.pdf
    • http://alicevonlindenau.com/uploads/1/3/0/7/130739719/luniw_givepobaleweku_susotigod_zikanemo.pdf
    • http://iusedtobetechnical.com/uploads/1/3/0/7/130738700/c28b667c8a6.pdf
    • http://morgansparkson.com/uploads/1/3/0/5/130589427/3952270.pdf
    • http://kyrstinkempf.com/uploads/1/3/0/9/130968947/rugilopoxes-nibabalorud.pdf
    • http://wileyscience.com/uploads/1/3/1/0/131070109/927db36748.pdf
    • http://www.stgeorgecountrydancing.com/uploads/1/3/0/5/130588964/mokoju_bipafe.pdf
    • http://lhbathco.com/uploads/1/3/0/6/130603749/749358.pdf
    • http://garavatta.com/uploads/1/3/0/7/130738855/fd5f64.pdf
    • http://inventureconsulting.net/uploads/1/3/0/5/130542710/b4c19b110e99ef.pdf
    • 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_off00006d3d.bin
c6b9c15eddf02094166085146120dc47ef2773755fb83aa8718ab0556158f78f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D3D 7960 bytes

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