Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a10a621ba6dde3…

MALICIOUS

PDF

35.5 KB Created: 2020-04-12 02:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e0bc6646b65355afacc6a3cf45936254 SHA-1: d14cb1225e0586e07ca71e46d0af612db4ae8129 SHA-256: b4a10a621ba6dde36e7eed6d9df86387d2e9e51b9f6b0cb1e0253a3e2e7a041a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The primary URL, http://lmhrealtyservices.net/uploads/1/3/0/2/130288864/130288864.html#define+el+concepto+de+relieve+submarino, suggests a lure to a webpage. The ML classifier strongly indicates maliciousness, supporting the interpretation that this is a malicious link farm designed to direct users to potentially harmful content.

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://lmhrealtyservices.net/uploads/1/3/0/2/130288864/130288864.html#define+el+concepto+de+relieve+submarino
    • http://petssheardelight.com/uploads/1/3/0/2/130292173/2887672.pdf
    • http://amagisgroup.com/uploads/1/3/0/6/130621579/7030390.pdf
    • http://piccolospizzaandice.com/uploads/1/3/1/4/131438580/juvelax-bawulo-malari-voketed.pdf
    • http://crownfireandsecurity.com/uploads/1/3/0/3/130323411/tixozametaxeke.pdf
    • http://unexplainedinfertility.org/uploads/1/3/0/6/130604109/mofezezenolaj_dugudukiporodop_jofededaletaduv.pdf
    • http://blondiau.org/uploads/1/3/1/4/131407629/2882388.pdf
    • http://houzz-2-home.com/uploads/1/3/0/8/130873998/mepoximepez.pdf
    • http://grouthound.com/uploads/1/3/0/6/130622002/godunuvunejiw_lifogije_difopozijitalup.pdf
    • http://wheretocut.com/uploads/1/3/0/5/130551429/5e65777.pdf
    • http://giteruralenfrance.com/uploads/1/3/0/2/130289240/jipoximuzekeb-jokibimafaze.pdf
    • http://sitemove557.com/uploads/1/3/0/5/130590163/20bead7d.pdf
    • http://giteruralenfrance.com/uploads/1/3/0/
    • 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_off00006368.bin
3a915373d5d3aab55cb3b02200642318fb40ba38eafbe58a38019f7c9ea49a3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6368 7840 bytes

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